System Development Methodology

What is System Development
Methodology?
This is a framework that is used to structure plan and
control the process of developing an Information
System.

System Development Life Cycle (SDLC)
Planning
Analysis
Design
Development
Implementatio
n
Maintenance

Common Methodologies
Waterfall
Methodology
Spiral
Methodology
Agile
Methodology
Rapid
Application
Methodology

Waterfall Methodology:
Waterfall model is very famous method in System Development Methodologies.
This model describes a development methodology, that is rigid and linear.
Logical progression of steps throughout product life cycle

Diagram :
Requirement Analysis
System Design
Implementation
System Testing
System Deployment
System
Maintenance

Advantages
Progress of System
Development is measurable
Conserves resources
Ideal for supporting less
experience project teams and
project managers
Disadvantages
Difficult to respond to changes
System performance cannot be
tested until the system is almost fully
coded
It has a rigid and inflexible
procedure
One phase must be
completed before the next
phase start

Basic Principles :
• Emphasis is on planning, time schedules,
target dates, budgets and implementation
of an entire system at one time.
• Tight control is maintained over the life of
the project through the use of extensive
written documentation, as well as through
formal reviews and approval by the user.

Spiral Methodology :
In the "Spiral Model," task regions are divided into four phases. In 1988, Barry
Boehm created the spiral model, which is an adaptive SDLC strategy. It allows a
project to cycle through development processes until the project is finished.

Diagram :
•Objective Setting
•Risk Assessment and Reduction
•Development and validation
•Planning

Advantages &
Disadvantages
Advantages
 High amount of risk analysis
 Good for large and mission-critical projects
 Software is produced early in the software
cycle
Disadvantages
 Can be a costly model to use
 Risk analysis requires highly specific
expertise
 Project’s success is highly dependent on the
risk analysis phase

Basic Principles :
• Focus is on risk assessment and on
minimizing project risk by breaking a
project into smaller segments and
providing more ease-of-change during the
development process, as well as
providing the opportunity to evaluate
risks and weigh consideration of project
continuation throughout the life cycle

Agile Methodology
• Agile Software Engineering combines a philosophy and a set of development
guidelines. A team is self-organizing and in control of its destiny. Design, over-
analysis and design are all part of an agile team's development process

Advantages &
Disadvantages
Advantages
 Re-write to the program, as the client decides to
changes are expected
 Additional Functionality can be added at a later
 Good for large and mission-critical projects
Disadvantages
 Can be a costly model to use
 Project’s success is highly dependent on the
risk analysis phase
 Risk analysis requires highly specific
expertise

Basic Principles :
• Customer Satisfaction - Highest priority
is to satisfy the customer through early
and continuous delivery of valuable
software
• Review the work regularly – At regular
intervals, the team reflects on how to
become more effective, then tunes and
adjusts its behavior accordingly

Rapid Application Development Methodology
Rapid Application usually embraces object-oriented programming methodology,
which inherently fosters software re-use. The most popular OOP languages, C++
and Java, are offered in Visual programming packages.

Basic Principles :
• Key objective is for fast development and
delivery of high-quality systems
• Low investment cost
• Attempts to reduce inherent project risk
by breaking a project into smaller
segments providing more ease-of-
change during the development process

System Development Methodology

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