Scrum

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Scrum
Overview
Agile has become one of the big buzzwords in the software development industry.
But what exactly is agile development? Put simply, agile development is a different
way of executing software development teams and projects.
To understand what is new, let us recap the traditional methods. In conventional
software development, the product requirements are finalized before proceeding with
the development.
Waterfall Model
The most commonly used software development model with this characteristic is the
Waterfall Model as depicted in the following diagram. However, in most of the cases,
new functionalities get added, and also earlier requirements may change. The
Waterfall model is not structured to accommodate such continuous changes in
requirements. Further, the user will not have clarity on the functionality of the
product till the product becomes available in its entirety.

Iterative Incremental Model
In the iterative incremental model, the development starts with a limited number of
finalized and prioritized requirements. The deliverable is a working increment of the
product. A set of activities ranging from requirements to code development is called
an iteration. Based on the functionality of the increment and any or all of the new,
modified, pending requirements, the next lot of requirements is given to the
subsequent iteration. The outcome of the subsequent iteration is an enhanced
working increment of the product. This is repeated till the product accomplishes the
required functionalities.
The user is usually not involved in the development work and it may cause
communication gaps resulting in incorrect functionalities. The involvement is positive
for the development team, but is demanding on the time of the team and can add
delays. Further, any informal requirement changes during an iteration may lead to

confusion and may also create scope creeps. With this premise, Agile development
came into existence.
Agile Development
Agile development is based on iterative incremental development, in which
requirements and solutions evolve through team collaboration. It recommends a
time-boxed iterative approach, and encourages rapid and flexible response to
change. It is a theoretical framework and does not specify any particular practice
that a development team should follow. Scrum is a specific agile process framework
that defines the practices required to be followed.
Early implementations of agile methods include Rational Unified
Process(1994), Scrum (1995), Crystal Clear, Extreme Programming (1996), Adaptive
Software Development, Feature Driven Development (1997), and Dynamic Systems
Development Method (DSDM) (1995). These are now collectively referred to as agile
methodologies, after the Agile Manifesto was published in 2001.
Agile Manifesto
The Agile Manifesto was published by a team of software developers in 2001,
highlighting the importance that needs to be given to the development team,
accommodating changing requirements, customer involvement.
The Agile Manifesto is as follows:
“We are uncovering better ways of developing software by doing it and helping
others do it. Through this work, we have come to value:
 Individuals and interactions over processes and tools
 Working software over comprehensive documentation
 Customer collaboration over contract negotiation
 Responding to change over following a plan
That is, while there is value in the items on the right, we value the items on the left
more."
…Manifesto for Agile Software Development, Authors: Beck, Kent, et al. (2001)
Definition of Agile Manifesto Items
The manifesto items on the left can be described as follows:
Manifesto Item Description

Individuals and
interactions
Importance needs to be given to:
 self-organization and self-motivation of the team
members
 continuous interaction for work, clarifications,
information among the team members
Working Software Delivery of working software at short duration intervals helps
gain customer trust and assurance in the team.
Customer
collaboration
Constant involvement of customer with the development
team ensures communication of necessary modifications.
Responding to
change
Focus on quick response to the proposed changes, which is
made possible with short duration iterations.
The key element of Agile Manifesto is that we must trust people and their ability to
collaborate. For this reason, the specific agile methodologies developed tap the
abilities of team members by emphasizing teamwork and collaboration throughout
the life-cycle of the project.
Key Principles of Agile
The Agile Manifesto is based on the following principles:
Principle Description
Satisfaction and
Delivery
Customer satisfaction through early and continuous
working software.
Welcoming Change Welcome changing requirements, even at later stages of
development.
Deliver Frequently Deliver working software frequently (weekly rather than
monthly).
Communication is the
Key
Ensure close association of developers with business
people on daily basis.
Environment and Trust Build projects around motivated individuals. Give them
necessary support and trust them.
Face-to-face
Communication
Encourage face-to-face conversation to ensure efficient
and effective communication.

Software as Measure
of Progress
Working software is the primary measure of progress.
Sustainable
Development
Promote sustainable development with the ability to
maintain a constant pace throughout the development.
Attention to Details Continuous attention to technical excellence and good
design.
The Power of Less Simplicity is essential.
Self-organizing Teams Regular attention of the team on becoming effective in
changing circumstances.
Agile Methodologies
Dynamic System Development Methodology (DSDM)
It is an agile framework for software projects. It was used to fine-tune the traditional
approaches. The most recent version of DSDM is called DSDM Atern. The name Atern
is a short for Arctic Tern - a seabird that can travel vast distances that represents
many features of the method which are natural ways of working such as prioritization
and collaboration.
Scrum
It is the most popular agile framework, which concentrates particularly on how to
manage tasks within a team-based development environment. Scrum uses iterative
and incremental development model, with shorter duration of iterations. Scrum is
relatively simple to implement and focuses on quick and frequent deliveries.
Extreme Programming (XP)
It is a type of agile software development. It advocates frequent releases in short
development cycles, which is intended to improve productivity and introduce
checkpoints where new customer requirements can be adopted. The methodology
takes its name from the idea that the beneficial elements of traditional software
engineering practices are taken to extreme levels. (Extreme Programming is a
software-development discipline that organizes people to produce higher-quality
software more productively.) XP addresses the analysis, development, and test
phases with novel approaches that make a substantial difference to the quality of the
end-product.
Test-driven Development (TDD)

It is a software development process that relies on the repetition of a very short
development cycle: first the developer writes an automated test case that defines a
desired improvement or a new function, then it produces the least amount of code to
pass that test, and finally brings the new code to acceptable standards.
Lean
It is a production practice that considers the expenditure of resources for any goal
other than the creation of value for the end-customer to be wasteful, and thus a
target for elimination. Working from the perspective of the customer who consumes
a product or service, the term value is defined as any action or process that a
customer would be willing to pay for. Lean is centered on preserving value with less
work.
Kanban
It is a system to improve and keep up a high level of production. Kanban is one
method through which Just-In-Time (JIT), the strategy the organizations employ to
control the inventory expenses, is achieved. Kanban became an effective tool in
support of running a production system as a whole, and it proved to be an excellent
way for promoting improvement.
Conclusion
Over the last 10 years, there is an ever-increasing volume of success stories, where
companies have dramatically improved the success and performance of their IT
development teams and projects with agile practices. This has caused agile to be
widely adopted across a variety of industries, including media and technology, large
corporates, and even government.
Agile Framework helps teams to benefit from:
 Faster Time to Deliver/ Market
 Reduce Uncertainty and Risk
 Increase Return on Investment (ROI) by focusing on Customer Value
Among these different agile methodologies, Scrum has proved to be extremely
successful worldwide over the last 20 years.
Scrum - Framework
Scrum is a framework for developing and sustaining complex products. Ken
Schwaber and Jeff Sutherland developed Scrum. Together, they stand behind the
Scrum Rules.

Scrum Definition
Scrum is a framework within which people can address complex adaptive problems,
while productively and creatively delivering products of the highest possible value.
Scrum is a process framework that has been used to manage complex product
development since the early 1990s. Scrum is not a process or a technique for
building products; rather, it is a framework within which you can employ various
processes and techniques. Scrum makes clear the relative efficacy of your product
management and development practices so that you can improve.
The Scrum framework consists of Scrum Teams and their associated roles, events,
artifacts, and rules. Each component within the framework serves a specific purpose
and is essential to Scrum’s success and usage.
The rules of Scrum bind together the events, roles, and artifacts, governing the
relationships and interaction between them. The rules of Scrum are described
throughout this tutorial.
Note - Across the industry, there are misconceptions that Scrum means no
documentation, scrum team consists of only developers, and so on. It is not entirely
so; we will give clarifications on these in later sections.
Scrum Process Framework

In Scrum, the prescribed events are used to create regularity. All events are time-
boxed events, such that every event has a maximum duration. The events are
described more elaborately in the subsequent chapters.
Sprint
The heart of Scrum is a Sprint, a time-box of two weeks or one month during which
a potentially releasable product increment is created. A new Sprint starts
immediately after the conclusion of the previous Sprint. Sprints consist of the Sprint
planning, daily scrums, the development work, the Sprint review, and the Sprint
retrospective.
 In Sprint planning, the work to be performed in the Sprint is planned collaboratively by the
Scrum Team.
 The Daily Scrum Meeting is a 15-minute time-boxed event for the Scrum Team to
synchronize the activities and create a plan for that day.
 A Sprint Review is held at the end of the Sprint to inspect the Increment and make
changes to the Product Backlog, if needed.
 The Sprint Retrospective occurs after the Sprint Review and prior to the next Sprint
Planning. In this meeting, the Scrum Team is to inspect itself and create a plan for
improvements to be enacted during the subsequent Sprint.
Conclusion
Scrum is a process framework that defines certain rules, events, and roles to bring in
regularity. However, it can be adapted to any organization, based on needs, provided
the basic scrum rules are not violated.
Scrum - Roles
The Scrum Team consists of three roles, namely a ScrumMaster, a Product Owner,
and the Team.
ScrumMaster
The ScrumMaster (sometimes written as the Scrum Master, although the official term
has no space after “Scrum”) is the keeper of the scrum process. He/she is
responsible for-
 making the process run smoothly
 removing obstacles that impact productivity
 organizing and facilitating the critical meetings

Product Owner
The Product Owner is responsible for maximizing the value of the product and the
work of the Team. How this is done may vary widely across organizations, Scrum
Teams, and individuals.
The Product Owner is the sole person responsible for managing the Product Backlog.
Product Backlog management includes-
 Expressing Product Backlog items clearly.
 Ordering the Product Backlog items to best achieve goals and missions.
 Optimizing the value of the work the Team performs.
 Ensuring that the Product Backlog is visible, transparent, and clear to all, and shows what
the Team will work on further.
 Ensuring that the Team understands items in the Product Backlog to the level needed.
The Product Owner may do the above work, or have the Team do it. However, the
Product Owner remains accountable for these tasks.
The Product Owner is one person, not a committee. The Product Owner may
represent the desires of a committee in the Product Backlog, but those wanting to
change a Product Backlog item’s priority must address the Product Owner.
For the Product Owner to succeed, the entire organization must respect his or her
decisions. The Product Owner’s decisions are visible in the content and ordering of
the Product Backlog. No one is allowed to tell the Team to work from a different set
of requirements, and the Team is not allowed to act on what anyone else says. This
is ensured by ScrumMaster.
The Team
The Team is self-organizing and cross-functional. That means the team comprises of
analysts, designers, developers, testers, etc. as appropriate and as relevant to the
project.
Some people in the industry refer to this team as development team. However, such
a reference is leading to controversy that the team can have only developers and no
other roles. It is an obvious understanding that it is only a misconception. To develop
a software product, we require all the roles and that is the essence of scrum – the
team will function in collaboration. Cross-functional teams have all competencies
needed to accomplish the work without depending on others not part of the team,

and thus time and effort can be saved. The team model in Scrum is designed to
optimize flexibility, creativity, and productivity.
Optimal Team size is small enough to remain nimble and large enough to complete
significant work within a Sprint. The Team size should be kept in the range from five
to nine people, if possible. Fewer than five team members decrease interaction and
results in smaller productivity gains. Having more than nine members requires too
much coordination.
The scrum team works together closely, on a daily basis, to ensure the smooth flow
of information and the quick resolution of issues. The scrum team delivers product
iteratively and incrementally, maximizing opportunities for feedback. Incremental
deliveries of a complete product ensure a potentially useful version of working
product is always available.
Scrum - ScrumMaster
ScrumMaster is a trained responsible person, who renders services as described
below -
ScrumMaster Services to the Product Owner
The ScrumMaster serves the Product Owner in several ways, including -
 Finding techniques for effective Product Backlog management.
 Helping the Scrum Team understand the need for clear and concise Product Backlog items.
 Understanding product planning in an empirical environment.
 Ensuring that the Product Owner knows how to arrange the Product Backlog to maximize
value.
 Understanding and practicing agility.
 Facilitating Scrum events as needed.
ScrumMaster Services to the Scrum Team
The ScrumMaster serves the Scrum Team in several ways, including -
 Coaching the Scrum Team in self-organization and cross-functionality.
 Helping the Scrum Team to create high-value products.
 Removing impediments to the Scrum Team’s progress.

 Facilitating Scrum events as requested or needed.
 Coaching the Scrum Team in organizational environments in which Scrum is not yet fully
adopted and understood.
ScrumMaster Services to the Organization
The ScrumMaster serves the organization in several ways, including-
 Leading and coaching the organization in its Scrum adoption.
 Planning Scrum implementations within the organization.
 Helping employees and stakeholders understand and enact Scrum and empirical product
development.
 Causing change that increases the productivity of the Scrum Team.
 Working with other ScrumMasters to increase the effectiveness of the application of Scrum
in the organization.
Conclusion
Scrum is a process framework that defines certain rules, events, and roles to bring in
regularity. However, it can be adapted to any organization, based on needs, provided
the basic scrum rules are not violated.
Scrum - Events
Scrum Process Framework can be viewed by means of a sequence of events and the
corresponding artifacts. The Scrum events are time-boxed events. That means, in a
project, every scrum event has a predefined maximum duration. These events
enable transparency on the project progress to all who are involved in the project.
The vital events of scrum are-
 The Sprint
 Sprint Planning
 Daily Scrum Meetings
 The Sprint Review
 The Sprint Retrospective
The Sprint
During a Sprint, a working product Increment is developed. It is usually of duration
two weeks or one month, and this duration remains constant for all the sprints in the

project. We cannot have varying durations for the different sprints in a project. A
new Sprint starts immediately after the conclusion of the previous Sprint.
The Sprint Goal is an objective set for the Sprint. It provides guidance to the Team
on why it is building the Increment. It is created during the Sprint Planning meeting.
The scope of the sprint is clarified and re-negotiated between the Product Owner and
the Team as more about the requirements is learned. Thus, each Sprint is associated
with it, a definition of what is to be built, a design, and the flexible plan that will
guide building it, the development work, and the resultant product increment.
A Sprint should be cancelled if the Sprint Goal becomes obsolete. This might occur if
the organization changes direction or if market or technology conditions change. A
sprint can be cancelled only by product owner, though others have an influence on
the same.
Due to the short duration nature of Sprints, cancellation during a sprint rarely makes
sense. As the sprint cancellations consume resources, for getting re-organized into
another Sprint, they are very uncommon.
If a Sprint is cancelled, and part of the work produced during the sprint is potentially
releasable, the Product Owner typically accepts it. All the incomplete Sprint Backlog
Items are put back into the Product Backlog.
Sprint Planning
The work to be performed in the Sprint is planned in the Sprint Planning Meeting.
Sprint Planning Meeting is of duration of maximum of four hours for two weeks
sprints and eight hours for one month Sprints. It is the responsibility of the Scrum
Master to ensure that the meeting takes place and that all the required attendees are
present and understand the purpose of the scheduled meeting. The Scrum Master
moderates the meeting to monitor the sustenance of discussion and closure on time.
Sprint Planning focuses on the following two questions -
 What needs to be and can be delivered in the Sprint Increment?
 How will the work needed for the execution of Sprint be achieved?
The inputs to this meeting are -
 The Product Backlog
 The latest product Increment
 Projected capacity of the Team during the Sprint
 Past performance of the Team

The Scrum Team discusses the functionality that can be developed during the Sprint.
Product Owner provides clarifications on the Product Backlog items. The team selects
the items from the Product Backlog for the Sprint, as they are the best to assess
what they can accomplish in the Sprint. The Team comprises of analysts, designers,
developers, and testers. The work is carried out in a collaborative fashion, thus
minimizing re-work.
The Scrum Team then comes up with Sprint Goal. The Sprint Goal is an objective
that provides guidance to the Team on why it is building the Product Increment. The
Team then decides how it will build the selected functionality into a working product
Increment during the Sprint. The Product Backlog items selected for this Sprint plus
the plan for delivering them is called the Sprint Backlog.
Work during a sprint is estimated during sprint planning and may be of varying size
and/or effort. By the end of the Sprint Planning meeting, the work is divided into
tasks of duration of one day or less. This is to enable the ease of work allocation, and
tracking the completion. If the Team realizes that it has too much or too little work,
it can renegotiate the selected Product Backlog items with the Product Owner.
The Team may also invite others (not part of Scrum Team) to attend the Sprint
Planning meeting to obtain technical or domain advice or help in estimation.
Daily Scrum Meetings
The Daily Scrum Meeting is a 15-minute meeting for the Team, conducted daily to
quickly understand the work since the last Daily Scrum Meeting and create a plan for
the next 24 hours. This meeting is also referred to as Daily Stand up Meeting.
The Daily Scrum Meeting is held at the same time and same place every day to
reduce complexity.
During the meeting, each Team member explains -
 What did he do yesterday that helped the Team meet the Sprint Goal?
 What will he do today to help the Team meet the Sprint Goal?
 Does he see any impediments that prevent him or the Team from meeting the Sprint Goal?
Daily Scrum is mistaken to be a status tracking event, though, in fact, it is a
planning event.
The input to the meeting should be how the team is doing toward meeting the Sprint
Goal, and the output should be a new or revised plan that optimizes the team’s
efforts in meeting the Sprint Goal.

Though the Scrum Master coordinates the Daily Scrum Meeting and ensures that the
objectives of the meeting are met, the Meeting is the responsibility of the Team.
If necessary, the Team may meet immediately after the Daily Scrum Meeting, for
any detailed discussions, or to re-plan the rest of the Sprint’s work.
Following are the benefits of Daily Scrum Meetings -
 Improve communication within the Team.
 Identify impediments, if any, in order to facilitate an early removal of the same, so as to
minimize impact on the Sprint.
 Highlight and promote quick decision-making.
 Improve the Team’s level of knowledge.
Sprint Review
A Sprint Review is held at the end of every Sprint. During the Sprint Review, a
presentation of the increment that is getting released is reviewed. In this meeting,
the Scrum Team and the stakeholders collaborate to understand what was done in
the Sprint. Based on that, and any changes to the Product Backlog during the Sprint,
the attendees arrive at the next steps required that could optimize value. Thus, the
objective of Sprint Review is to obtain feedback and progress unitedly.
The Sprint Review is normally held for two hours for two week sprints and for four
hours for one month sprints.
The Scrum Master ensures that -
 The meeting takes place.
 The participants understand the purpose.
 The meeting is focused on the required agenda and is completed within the required
duration.
The Sprint Review includes the following aspects -
 Attendees include the Scrum Team and key stakeholders, as invited by the Product Owner.
 The Product Owner explains what Product Backlog items have been completed during the
sprint and what has not been completed.

 The Team discusses what went well during the Sprint, what problems it ran into, and how
those problems were solved.
 The Team demonstrates the work that it has completed and answers questions, if any,
about the Increment.
 The entire group then discusses on what to do next. Thus, the Sprint Review provides
valuable input to Sprint Planning of the subsequent Sprint.
 The Scrum Team then reviews the timeline, budget, potential capabilities, and marketplace
for the next anticipated release of the product increment.
 The outcome of the Sprint Review is an updated Product Backlog, which defines the
probable Product Backlog items for the next Sprint.
Sprint Retrospective
The Sprint Retrospective occurs after the Sprint Review and prior to the next Sprint
Planning. This is usually a one hour meeting for two-week duration sprints and a
three hour meeting for one month duration Sprints.
The purpose of the Sprint Retrospective is to -
 Combine the learnings from the last Sprint, with regards to people, relationships, process,
and tools.
 Identify the major items that went well and potential improvements.
 Creation of a plan for implementing improvements to increase product quality.
The Sprint Retrospective is an opportunity for the Scrum Team to introspect and
improve within the Scrum process framework so as to make the next Sprint outcome
more effective.
Reference
Scrum Guide © 1991-2013 Ken Schwaber and Jeff Sutherland, All Rights Reserved.
Scrum - Artifacts
Scrum Artifacts provide key information that the Scrum Team and the stakeholders
need to be aware of for understanding the product under development, the activities
done, and the activities being planned in the project. The following artifacts are
defined in Scrum Process Framework -
 Product Backlog

 Sprint Backlog
 Burn-Down Chart
 Increment
These are the minimum required artifacts in a scrum project and project artifacts are
not limited by these.
Product Backlog
The Product Backlog is an ordered list of features that are needed as part of the end
product and it is the single source of requirements for any changes to be made to
the product.
The Product Backlog lists all features, functions, requirements, enhancements, and
fixes that constitute the changes to be made to the product in future releases.
Product Backlog items have the attributes of a description, order, estimate, and
value. These items are normally termed as User Stories. The Product Owner is
responsible for the Product Backlog, including its content, availability, and ordering.
A Product Backlog is an evolving artifact. The earliest version of it may contain only
the initially known and best understood requirements. The Product Backlog gets
developed as the product, and the environment in which it will be used, progress.
The Product Backlog constantly changes to incorporate what is required to make it
effective. As long as a product exists, its Product Backlog also exists.
As the product being built is used and gains value, the Product Backlog becomes a
larger and more exhaustive list. Changes in business requirements, market
conditions, or technology, cause changes in the Product Backlog, making it a live
artifact.
Product Backlog refinement means adding detail, estimates, and priority order to the
Product Backlog items. This is an ongoing process performed by the Product Owner
and the Team. The Scrum Team decides how and when refinement is to be done.
Product Backlog items can be updated at any time by the Product Owner or at the
Product Owner’s discretion.
Higher-ordered Product Backlog items are usually clearer and more detailed than
lower-ordered ones. More precise estimates are made based on the greater clarity
and increased detail. The lower the order, the lesser is the detail.
Product Backlog items that may likely be the candidate requirements for the
upcoming Sprint are refined so that these items can be developed during the Sprint.

Product Backlog items that can be developed by the Team within one Sprint are
deemed to be ready for selection in a Sprint planning meeting.
Sprint Backlog
The Sprint Backlog is the set of Product Backlog items selected for the Sprint, plus a
plan for delivering the product Increment and realizing the Sprint Goal.
The Sprint Backlog is a forecast by the Team about what functionality will be made
available in the next Increment and the work needed to deliver that functionality as a
working product Increment.
The Sprint Backlog is a plan with enough detail that can be understood but the Team
to track in the Daily Scrum. The Team modifies the Sprint Backlog throughout the
Sprint, and the Sprint Backlog emerges during the Sprint. This emergence occurs as
the Team works through the plan and learns more about the work needed to achieve
the Sprint Goal.
As new work is required, the Team adds it to the Sprint Backlog. As work is
performed or completed, the estimated remaining work is updated. When elements
of the plan are deemed unnecessary, they are removed. Only the Team can change
its Sprint Backlog during a Sprint. The Sprint Backlog is a highly visible, real-time
picture of the work that the Team plans to accomplish during the Sprint, and it
belongs solely to the Team.
Increment
The Increment is the sum of all the Product Backlog items completed during a Sprint
combined with the increments of all previous Sprints. At the end of a Sprint, the new
Increment must be a working product, which means it must be in a useable
condition. It must be in working condition regardless of whether the Product Owner
decides to actually release it.
The Scrum Team needs to have consensus on what is considered to be an
Increment. This varies significantly per Scrum Team, but, team members must have
a shared understanding of what it means for work to be complete. This is used to
assess when work is complete on the product Increment.
The same understanding guides the Team in knowing how many Product Backlog
items it can select during a Sprint Planning. The purpose of each Sprint is to deliver
Increments of potentially releasable functionality.
Teams deliver an Increment of product functionality every Sprint. This Increment is
useable, so a Product Owner may choose to release it immediately. If the

understanding of an increment is part of the conventions, standards, or guidelines of
the development organization, all Scrum Teams must follow it as a minimum. If it is
not a convention of the development organization, the Scrum Team must define a
definition of Increment appropriate for the product.
Each Increment is additive to all prior Increments and thoroughly tested, ensuring
that all Increments work together.
As Scrum Teams mature, it is expected that their definitions of Increments expands
to include more stringent criteria for higher quality. Any one product should have a
definition of Increment that is a standard for any work done on it.
Sprint Burn-Down Chart
At any point in time in a Sprint, the total work remaining in the Sprint Backlog can
be summed. The Team tracks this total work remaining for every Daily Scrum to
project the likelihood of achieving the Sprint Goal. By tracking the remaining work
throughout the Sprint, the Team can manage its progress.
Sprint Burn-Down Chart is a practice for trending the work expended by the Scrum
Team. This has been proven to be a useful technique in monitoring the Sprint
progress towards the Sprint Goal.
The Product Owner tracks this total work remaining at least every Sprint Review. The
Product Owner compares this amount with work remaining at previous Sprint
Reviews to assess progress toward completing the projected work by the desired
time for the goal. This information is shared with all stakeholders.
Conclusion
Scrum’s roles, events, artifacts, and rules are inevitable. If only some parts of Scrum
are implemented, the result is not Scrum. Scrum needs to be implemented in its
entirety and functions well if aligned with other techniques, methodologies, and
practices.
Reference
Scrum Guide © 1991-2013 Ken Schwaber and Jeff Sutherland, All Rights Reserved.
Scrum - User Stories
As you have understood, the User Stories are commonly used to describe the
product features and will form part of the Scrum Artifacts – Product
Backlogand Sprint Backlog.

User Stories
In software development, the product features play a crucial role. It is the features
that the user ultimately likes to use in the final product. They are known as
Requirements in the general terminology. The software development project success
lies in understanding the user requirements accurately and appropriately, and then
implementing them in the final product. Thus, requirements or product features need
to be thoroughly known to the development project team.
In 1999, Kent Beck came up with a term User Stories for the product features. He
described that a User Story is narrated from user perspective regarding what he or
she wants to have rather that what system can do for him. Thus, the view changed
from product to user completely and User Stories became de facto standard for
Requirements in all Agile frameworks.
In Scrum projects, the Product Backlog is a list of user stories. These User Stories
are prioritized and taken into the Sprint Backlog in the Sprint Planning Meeting.
Estimation is also based on user stories and the size of the product is estimated in
User Story Points.
The User Story Structure
The User Story structure is as follows -
As a <Type of User>,
I want <To Perform Some Task>,
So that <I can achieve some goal/benefit/value>.
Let us take a look at how a user story is framed for the scenario of a Bank Customer
withdrawing cash from ATM.
User Story: Customer’s Cash Withdrawal
As a Customer,
I want to withdraw cash from an ATM,
So that I don't have to wait in line at the Bank
User Story Acceptance Criteria
Each User Story also has Acceptance Criterion defined, so that correctness of
implementation of the user story is confirmed by passing the Acceptance Test that is
based on the Acceptance Criterion.

Following are the sample acceptance criterion for the example of User Story
Customer’s Withdrawal of Cash.
Acceptance Criterion 1:
Given that the account is creditworthy
 And the card is valid
 And the dispenser contains cash,
When the customer requests the cash
Then ensure the account is debited
 And ensure cash is dispensed
 And ensure the card is returned.
Acceptance Criterion 2:
Given that the account is overdrawn
 And the card is valid
When the customer requests the cash
Then ensure the rejection message is displayed
 And ensure cash is not dispensed
 And ensure the card is returned.
Writing User Stories
Product Owner is responsible for the Product Backlog and thus for the User Stories.
However, it does not mean that only product owner writes the user stories. Anyone
in the Scrum Team can write the user stories, and the activity can be spread across
the project as requirements get refined and new functionalities get added.
Non-Functional Requirements in User Stories
It is possible to incorporate the non-functional requirements also in the user stories.
In the given ATM example, the ATM to be available to the user 24X7, 365 days is a
non-functional requirement, which can be described by a use case.
Managing User Stories
User Stories are managed in the Product Backlog. The User Stories are ordered
according to priority. The most prioritized user stories are refined to granular level,
while the least priority user stories are kept at a lesser detail level. For every sprint,

the most prioritized and hence more granulated user stories are taken into the sprint
backlog. If a user story is to be added to the product backlog, its priority is first
determined, and it is placed according to its place as per the priority. The user
stories can be reprioritized at any time. It is also possible to remove any of the user
stories if required.
Benefits with User Stories
 The major benefit of User Story lies in the user centric definition itself. This is because,
ultimately, it is the user who will be using the product in the relevant user scenarios. It
connects the end users to the team members.
 The syntax of the User Story itself ensures to capture the goal or benefit or value that the
user wants to achieve.
 Since the acceptance criteria forms part of user story itself, it will be an added advantage
to the Scrum Team.
 It is possible to make changes to a user story in course of the execution of the project. If
the scope of the user story becomes large, it needs to be split into smaller user stories.
The conditions in the acceptance criterion can also be changed.
 As working product increments are delivered to the users at the end of each sprint, the
scrum team can get feedback from the users in sprint review meeting. This enables
incorporation of feedback into the product continuously.
Conclusion
Scrum's User Stories bring the users closer to the Scrum team and prevents last-
minute surprises.
Scrum - Burn-Down Charts
The sprint tracking is usually done using Burn-Down Chart. Burn-Down Chart shows
the remaining effort in day-wise number of hours. For example, let us consider a 2-
week sprint -
Sprint Duration: 2 Weeks
No. of Days per Week: 5
No. of Hrs. per Day: 6
No. of Resources: 6
Hence, total remaining effort at the beginning of sprint is 2*5*6*6 = 360 hrs.

Therefore, in an ideal scenario, 36 hours of work gets reduced in the remaining work
and the burn-down chart looks as follows -
If the sprint work is done as planned daily, the scrum progress is almost aligned to
the ideal bar.
If the sprint work gets delayed and time commitment is not met, the burn-down
chart looks as follows -
But, as the burn-down chart is drawn daily, and the slippage is known early,
corrective actions can be taken to meet the sprint time line. Suppose, the team
stretches to meet the timeline, the burn-down chart looks as follows -

Thus, at any point in time in a Sprint, the total work remaining in the Sprint can be
visualized and possibility of meeting sprint timeline can be improved.
Conclusion
Burn-down charts aid the Scrum team to keep track of their progress and what
needs to be done to meet the sprint goal.
Scrum - Estimation
In Scrum Projects, Estimation is done by the entire team during Sprint Planning
Meeting. The objective of the Estimation would be to consider the User Stories for
the Sprint by Priority and by the Ability of the team to deliver during the Time Box of
the Sprint.
Product Owner ensures that the prioritized User Stories are clear, can be subjected
to estimation, and they are brought to the beginning of the Product Backlog.
As the Scrum Team in total is responsible for the delivery of the product increment,
care would be taken to select the User Stories for the Sprint based on the size of the
Product Increment and the effort required for the same.
The size of the Product Increment is estimated in terms of User Story Points. Once
the size is determined, the effort is estimated by means of the past data, i.e., effort
per User Story Point called Productivity.
Scrum Estimation Techniques
The Scrum Estimation of User Stories is in terms of the degree of difficulty for each
of the User Stories. To assess the degree of difficulty, a particular scale is used.
There are several types of scales that are used in Scrum Estimation. Following are
some examples -

 Numeric Sizing (1 through 10)
 T-shirt Sizes (XS, S, M, L, XL XXL, XXXL)
 Fibonacci Sequence (1, 2, 3, 5, 8, 13, 21, 34, etc.)
 Dog Breeds (Chihuahua,………,Great Dane)
The estimation technique is normally chosen in such a way that the entire scrum
team is acquainted and comfortable with scale’s values. The most commonly used
and most popular technique is Planning Poker which is based on Fibonacci sequence.
Planning Poker Technique
In Planning Poker Estimation Technique, estimates for the User Stories are derived
by playing planning poker. The entire Scrum Team is involved and it results in quick
but reliable estimates.
Planning Poker is played with a deck of cards. As Fibonacci sequence is used, the
cards have numbers - 1, 2, 3, 5, 8, 13, 21, 34, etc. These numbers represent the
Story Points. Each estimator has a deck of cards. The numbers on the cards should
be large enough to be visible to all the team members, when one of the team
members holds up a card.
One of the team members is selected as the Moderator. Moderator reads the
description of the User Story for which estimation is being made. If the estimators
have any questions, Product Owner answers them.
Each estimator privately selects a card representing his or her estimate. Cards are
not shown until all the estimators have made a selection. At that time, all cards are
simultaneously turned over and held up so that all team members can see each
estimate.
In the first round, it is very likely that the estimations vary. The high and low
estimators explain the reason for their estimates. Care should be taken that all the
discussions are meant for understanding only and nothing is to be taken personally.
The moderator has to ensure the same.
The team can discuss the story and their estimates for few more minutes.
The moderator can take notes on the discussion that will be helpful when the specific
story is developed. After the discussion, each estimator re-estimates by again
selecting a card. Cards are once again kept private until everyone has estimated, at
which point they are turned over at the same time.

Repeat the process till the estimates converges to a single estimate that can be used
for the story. The number of rounds of estimation may vary from one user story to
another.
Benefits of Planning Poker Estimation
Planning poker combines three methods of estimation -
Expert Opinion : In an Expert Opinion based Estimation approach, an expert is
asked how long something will take or how big it will be. The expert provides an
estimate relying on his or her experience or intuition or gut feel.
Expert Opinion Estimation usually doesn’t take much time and is more accurate
compared to some of the analytical methods.
Analogy : Analogy Estimation uses comparison of User Stories. The User Story
under Estimation is compared with similar User Stories implemented earlier. This
results in accurate results as the estimation is based on proven data.
Disaggregation : Disaggregation Estimation is done by splitting a User Story into
smaller, easier-to-estimate User Stories. The user stories to be included in a Sprint
are normally in the range of two to five days to develop. Hence, the User Stories that
possibly take longer duration need to be split into smaller Use Cases. This approach
also ensures that there would be many stories that are comparable.
Conclusion
Planning Poker is an enjoyable, yet productive approach to estimating. As the
session is open for discussions before the final estimate is arrived, it would easy for
the team to come to a consensus and also have a broad view of the implementation
of the User Story at hand.
Scrum - Tools
Scrum Tools facilitate planning and tracking for Scrum projects. They provide a
single place for managing the product backlog, sprint backlog, planning and tracking
Sprints, displaying Burndown charts, conducting daily Scrum Meetings, and
conducting Scrum Retrospectives.
There are many different types of Scrum Tools available. Some are free (open
source), some are paid, and for some, you get a distilled version of the tool.
However, to get all the features and scalability, you need to buy a full version.
Available Scrum Tools

Following is a list of some Scrum Tools available in market as of day. The Open
Source Tools are marked with Asterisk.
Axosoft Airgile Agile Cockpit Jira
(GreenHopper)
Mingle
Scrumwise Agilo For Scrum Banana Scrum Kunagi OnTime Now
Version One AgileWrap Daily-Scrum Intervals Pango Scrum
Acunote Agile Tracking
Tool*
Digaboard* iMeta Agility Pivotal
Tracker
Agile Agenda Agile Task EasyBacklog Ice Scrum* pmScrum
Agile Bench Agile Soup Explain PMT Hansoft Prj Planner
Agile Buddy Agile Manager Agile Express* GravityDev Project Cards
Agile Fant* Agile Log Fire Scrum* Fulcrum* Quantum
Whisper
Quick Scrum Retrospectiva* Scrum’d Scrum
Factory*
Scrumpy
Rally Dev Scrinch* Scrum
Dashboard*
Scrum Edge Scrum Pad
Redmine
Backlogs
Scrum 2 Go Scrum Desk Scrum Do Tweet Scrum
Scrumrf Scrum Time* Scrumwise Select Solution
Factory
Tackle*
Urban Turtle ScrumTool Scrum Works Timebox Tangy
Orange
Scrum
Conclusion

Agile in general, Scrum in specific does not mean there is no documentation work.
The Scrum Artifacts are defined, Scrum Planning and Tracking are well established.
Scrum Tools facilitate in capturing and tracking information regarding the Scrum
Projects. The choice of the tool depends on the features required by the organization,
in addition to the needs for any other tool.
Scrum - Benefits
Scrum supports continuous collaboration among the customer, team members, and
relevant stakeholders. Its time-boxed approach and continuous feedback from the
product owner ensures working product with essential features all the times.
Additionally, Scrum provides different benefits to the different roles in the project.
Benefits to Customer
The Sprints are of shorter duration and prioritized user stories are taken up at every
sprint planning. It ensures that at every sprint delivery, the features as required by
the customer immediately are included. Further, if a customer raises any change
request, it will be absorbed in the current sprint, or included in the very next sprint.
Thus, the development team quickly responds to the customer’s requirements very
fast.
Benefits to Organization
Organization can focus on the effort required for development of the prioritized user
stories and thus reduce overhead and rework. Due to the specific benefits of scrum
to customer, increased efficiency of the development team, customer satisfaction
and hence customer retention and customer references will be possible. It increases
the market potential of the organization.
Benefits to Product Managers
Product Manager plays the role of Product Owner in the project. The responsibility of
the product owner is to ensure customer satisfaction. Since Scrum facilitates quick
responses, work prioritization, absorbing changes, product manager can easily
ensure that the work is aligned to customer needs, which in turn ensures customer
satisfaction.
Benefits to Project Managers
Project Manager plays the role of Scrum Master in the project. The collaborative
nature of Scrum facilitates easy and concrete planning and tracking. The use of
Burndown Charts to understand the work left, and the Daily Scrum meetings give the
Project Manager awareness about the state of the project at all times. This

awareness is essential to monitoring the project, and for catching and addressing
issues quickly.
Benefits to Development Team
Due to the time-boxed nature of sprints and working product increment delivery at
the end of every sprint, the development team becomes enthusiastic to see that
their work is used immediately. The built in team collaboration makes the team
enjoy the work they do. As the user stories for every sprint are based on customer
priorities, team also understands that their work is valued.
Scrum - Certifications
Scrum certifications are offered by the Scrum Alliance. Following Certifications are
being offered -
 Certified ScrumMaster (CSM)
 Certified Scrum Product Owner (CSPO)
 Certified Scrum Practitioner (CSP)
 Certified Scrum Coach (CSC)
 Certified Scrum Trainer (CST)
Certified ScrumMaster (CSM)
Certified Scrum Master is the basic certification to become a member of Scrum
Alliance, play Scrum Master’s Role, and be eligible for other certifications. The
certification requires attendance of the CSM course. After that, the candidate gets an
email specifying the details of the Scrum membership and the CSM online
examination. After taking the examination, the candidate is given the Certified
ScrumMaster (CSM) certification.
Certified Scrum Product Owner (CSPO)
Certified Scrum Product Owner is the basic certification to become a member of
Scrum Alliance, play Product Owner’s role, and be eligible for other certifications.
Certified Scrum Practitioner (CSP)
Certified Scrum Practitioner is the certification for experienced ScrumMasters and
Product Owners. The candidate should be a ScrumMaster or a Product Owner for at
least one year. The candidate must submit an application containing a detailed
description of what he or she has done in the specified role.

It is possible for a candidate to acquire the CSP certification immediately after the
CSM certification or CSPO certification, provided the candidate is actively practicing
the ScrumMaster’s role, or Product Owner’s role for the required duration.
Certified Scrum Coach (CSC)
Certified Scrum Coach is the certification for those who focus on coaching. The
certification requires that the candidate has coached Scrum Teams through their
adoption and mastery of Scrum for at least 1500 hours in the past 5 years.
Certified Scrum Trainer (CST)
Certified Scrum Trainer is the certification for those who want to teach CSM or CSPO
classes. Applicants must have either a CSM or CSPO, and should be a CSP for at
least a year before applying.
Scrum - FAQs
Following are some FAQs regarding Scrum -
Question: What is the difference between Scrum and Agile Development?
Answer : Agile Development is a software methodology, whereas Scrum is one of
process frameworks that follows Agile.
Question: Are Sprints and Iterations the same?
Answer : Both Sprints of Scrum and Iterations of Iterative Incremental model
deliver working product increments. However, these differ in that:
 Lifecycles of Sprint and Iteration are different.
 Sprints are time-boxed, while Iterations are not.
 Duration of Sprints is much less compared to durations of Iterations.
Question: Is Scrum Master a job title or a role that someone with an existing
job title fills?
Answer : Scrum Master is a role that someone with a job title fills. Normal practice
is that the person playing the role of project manager plays the ScrumMaster’s role
as well.
Question: Can Product Owner and ScrumMaster’s roles be played by the
same person?

Answer : No, since the ownership differs. Product Owner takes care of the Product
Backlog, Prioritization of User Stories, and Validation of the working product
increment with the user stories allocated to the Sprint.
Question: Is it that Scrum Projects need not have any Documentation?
Answer : No. Scrum Projects, like any other Projects require documentation such as
user stories, design, test cases, etc.
Conclusion
Agile and Scrum are not the same. Scrum is one of the process frameworks adapting
Agile. Scrum is advised to teams with experienced team members as the Framework
requires great collaboration and self-organization as well. If the Scrum rules are not
followed strictly, a project can lead to failure. Hence, it is necessary to have a proper
understanding of Scrum concepts among the entire team. Since the Sprints are of
short durations and are time-boxed, there is no time to learn the Scrum specifics on
the job, even when a Scrum Master continuously monitors the project.

Scrum

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