Software configuration management of students

Software Configuration
Management (SCM)
 ...... an umbrella activity that is applied throughout
the software process. Because changes can occur
at any time, SCM activities are developed to
(1) identify change
(2) control change
(3) ensure that change is being properly implemented
(4) report change to others who may have an interest
 The primary responsibility is the control of change

SCM Vs. Software maintenance
 Maintenance is a set of SE activities that
occur after software has been delivered to
the customer and put into operation
 SCM is a set of tracking and control activities
that begin when a software project begins
and terminate only when the software is
taken out of operation

What is Software Configuration?
 Items (such as programs, documents and
data) that comprise of all information
produced as part of the S/W process are
collectively called a Software Configuration
 As the software process progresses, the
number of software configuration items
(SCIs) grows rapidly

The Software Configuration
programs documents
data
The pieces

Baseline
 … an SCM concept that helps us to control
change without seriously impeding justifiable
change
 … a milestone in the development of software
that is marked by
 the delivery of one or more SCIs and
 the approval of these SCIs that is obtained through
an FTR

IEEE Definition for ‘Baseline’
…a specification or product that has
been formally reviewed and agreed
upon
 that thereafter serves as the basis for
further development
 that can be changed only through
formal change control procedures

Baselines
Steps in S/W process Baseline defined at this
level
System Engineering System specification
Requirements Analysis S/W requirements specification
Software design Design specification
Coding Source code
Testing Test plans/procedures/data
Release Operational system

Baselines
SCIs
SCIs
modified
Software
engineering
tasks
Formal
technical
reviews
SCIs
approved
SCIs
extracted
SCM
controls
SCIs
stored
Project database
System Specification
Software Requirements
Design Specification
Source Code
Test Plans/Procedures/Data
Operational System
BASELINES:

What is a configuration item?
An SCI is an aggregation of software that is designated for
configuration management and treated as a single entity in
the SCM process
An SCI is a document ,an entire suite of test cases , or a
named program component.
• Plans, Specification and design documentation
• Testing materials
• Software tools
• Source and executable code and Code libraries
• Data and data dictionaries
• Documentation for installation, maintenance, operations and
software use

Configuration objects
 A configuration object has a name, attributes
and is ‘connected’ to other objects by
relationships
 Basic object
 Aggregate object
 Compositional relationship (curved arrow)
 Inter-relationship (double-headed straight arrow)

Identification of objects in the
software configuration
 2 types of objects can be identified
 Basic object
 A ‘unit of text’ that has been created by a
software engineer during analysis, design,
coding or testing
 Aggregate objects
 A collection of basic objects and other
aggregate objects (conceptually it can be
viewed as a named (identified) list of pointers
that specify basic objects)

Software Configuration Objects
Design specification
data design
architectural design
module design
interface design
Component N
interface description
algorithm description
PDL
Data model
Test specification
test plan
test procedure
test cases
Source code

The SCM process
 How does an organization identify and manage
the many existing versions of a program in a
manner that will enable change to be
accommodated efficiently?
 How does an organization control changes before
and after software is released to a customer?
 Who has responsibility for approving and
prioritizing changes?
 How can we assure that changes have been
made properly?
 What mechanism is used to appraise others of
changes that are made?
… these questions lead to the definition of 5 SCM tasks

5 SCM tasks
Identification
Version control
Change control
Configuration auditing
Status reporting

The SCM Process
identification
change control
version control
configuration auditing
reporting
SCIs
Software
Vm.n

Version Control
 Combines procedures and tools to manage
the different versions of configuration objects
created during the software process
 An entity is composed of objects at the same
revision level
 A variant is a different set of objects at the
same revision level and coexists with other
variants
 A new version is defined when major
changes have been made to one or more
objects

Version Control
 A version control system is directly integrated
with four major capabilities:
 a project database (repository) that stores all relevant
configuration objects
 a version management capability that stores all
versions of a configuration object
 a make facility that enables the software engineer to
collect all relevant configuration objects and construct
a specific version of the software.
 an issues tracking (also called bug tracking)
capability that enables the team to record and track
the status of all outstanding issues associated with
each configuration object.

Change Control
 Change request
 submitted and evaluated to assess technical merit and
impact on the other configuration objects and budget
 Change report
 contains the results of the evaluation
 Change control authority (CCA)
 makes the final decision on the status and priority of the
change based on the change report

Change Control
 Engineering change order (ECO)
 generated for each change approved (describes change,
lists the constraints, and criteria for review and audit)
 Object to be changed is checked-out of the project
database subject to access control parameters for
the object
 Modified object is subjected to appropriate SQA and
testing procedures

Change Control
 Modified object is checked-in to the project
database and version control mechanisms are used
to create the next version of the software
 Synchronization control
 used to ensure that parallel changes made by different
people don’t overwrite one another

Change Control Process—I
change request from user
developer evaluates
change report is generated
change control authority (CCA) decides
request is queued for
action,
Engg. Change Order (ECO)
is generated
change request is denied
need for change is recognized
change control process—II
user is informed

Change Control Process-II
assign people to SCIs
check-out SCIs
make the change
review/audit the change
establish a “baseline” for testing
change control process—III
Check-in SCIs that have been changed

Change Control Process-III
perform SQA and testing activities
Promote changes for inclusion in next release
rebuild appropriate version of software
review/audit the change to all configuration items
include changes in new version (release)
Distribute new version

Software configuration management of students

More Related Content

Similar to Software configuration management of students (20)

More from AssadLeo1 (20)

Recently uploaded (20)

Software configuration management of students