software maintenance

SOFTWARE
MAINTENANCE
Submitted by,
D. Shanmugapriya
II-M. SC(IT)
Department of CS&IT
Nadar saraswathi college of arts and science

Introduction
• Software maintenance is the last stage of software life cycle.
• After the product has been released, the maintenance
phase keeps the software up to date with environment
changes &changing user requirements.
• It consumes about 40-70% of the cost of the entire life
cycle.
• Typically, the development cycle for a software product
spans 1 or 2 years, while the maintenance phase spans 5 to
10 years.

What is software maintenance
• Software maintenance is a very broad activity that
includes error corrections, enhancement of capabilities,
deletion of obslote capabilities, and optimization.
• As per IEEE, it is modification of software product after
delivery to correct faults, to improve performance or
other attributes or to adapt the product to a modified
environment.

Need for maintenance
• Correct errors.
• Change is user requirement with time.
• Changing hardware and software environment.
• To improve system efficiency.
• To modify the components.
• To optimize the code to run faster.

Aim of software maintenance
• To correct errors.
• To enhance the software by changing it’s function
• To update the software.
• To adapt software to cope with changes in the
environment.

Software maintenance
• Corrective(21%)
Preventive(4%)
Adaptive(25%)
Perfective(50%)

Enhancing Maintainablity
During Development
• Analysis activities :The analysis phase of software development is
concerned with determining customer requirements and
constraints, and establishing feasibility of the product.
• Standards and guidelines :various types of standards and
guidelines can be developed to enhance the maintainability of
software.
• Design activities :Architectural design is concerned with
developing the functional components, conceptual data structures
and interconnection in a software system.

Cont….
• Implementation activities :Implementation, like design,
should have the primary goal of producing software that
is easy to understand and easy to modify.
• Supporting documents :There are two particularly
important supporting documents that should be prepared
during the software development cycle in order to ease
maintenance activities.
• Every delivered software product should be accomplished
by a test suite.

Managerial Aspects Of
Software Maintenance
• Change control board :The change control board reviews
and approves all change request.
• The board may deny a request, recommend a modified
version of the change, or approve the change as submitted.
• Change request summaries :The status of change requests
and software maintenance activities should be
summarized on a weekly or monthly basis.

Cont…
• Quality assurance activities :The primary function of a
quality assurance group during software maintenance is
to ensure that software quality does not degrade as a
result of maintenance activities.
• Organizing maintenance programmers :Software
maintenance can be performed by the development team
or by members of a separate organization.

Configuration Management
• Configuration management is concerned with tracking
and controlling of the work products that Constitute a
software product.
• During product development, the various milestone
reviews result in formal acceptance of work products such
as the project plan, the requirements specifications, the
test plan, the user’s manual, the design documentation,
and the source code.

Cont…
• Configuration management data bases:software tools to
support configuration management include configuration
management data bases and version control library
systems.
• Version control libraries :A version control library may
be part of a configuration management data base, or it
may be used as a stand-alone tool.
• The Revision control system (RCS) is one example of a
version control library system.

software maintenance

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