1. Software Development Life
Cycle(SDLC)

2. INTRODUCTION:
 A Software Development Life Cycle (SDLC) is
any logical process used by a systems analyst to
develop an information system, including
requirements, validation, training, and user
(stakeholder) ownership
 A framework that describes the activities
performed at each stage of a software
development project.
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3. WHY DO WE NEED SDLC?
 SDLC has made the development of software
more easy than earlier.
 Because software can be very difficult and
complex. SDLC works as a framework to guide
the development to make it more systematic and
efficient.
 By SDLC we will be able to tell how long it will
take to complete the project, to test and deploy.
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4. SDLC – Characteristics:
 Disciplined approach
 Systems approach
 Iterative (not sequential)
 Cyclical
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5. SDLC PHASES
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6. SDLCPHASES
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7. SDLCPHASES
 Initialization
 Planning
 Requirement Analysis
 Design
 Development
 Integration and testing
 implementation
 Deployment
 Maintenance
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8. Initiation & feasibility:
Project objectives & Scope
Preliminary survey & feasibility
Technical
Economic
Operational
Project proposal and schedule
Identify assumptions &
constraints
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9. Initiation & feasibility:
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10. Planning:
 Develops a project management plan and other
planning documents.
 Provides the basis for acquiring the resources
needed to achieve a solution.
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11. Requirement Analysis:
 defines needed information, function,
behavior, performance and interfaces.
 Analyses user needs and develops user
requirements
 Create a detailed functional requirements
document.
 Refines project goals into defined functions and
operation of the intended application. Analyzes end-user
information needs.
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12. Design:
 data structures, software architecture,
interface representations, algorithmic
details.
 Transform detailed requirement into
complete, detailed systems design
document focuses on how to deliver the
required functionality.
 System design Describes desired features and
operations in detail, including screen layouts,
business rules, process diagrams, pseudo code
and other documentation.
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13. Development:
 Implementation is the part of the process where
software engineers actually program the code for
the project.
 Converts a design into a complete information
system includes acquiring and installing systems
environment; creating and testing databases
preparing test case procedures ;preparing test
files, coding compiling, refining programs.
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14. Integration and testing:
 Brings all the pieces together into a special
testing environment, then checks for errors, bugs
and interoperability.
 Software testing is an integral and important part
of the software development process. This part of
the process ensures that bugs are recognized as
early as possible.
 Documenting the internal design of software for
the purpose of future maintenance and
enhancement is done throughout development.
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15. Implementation:
 –source code, database, user documentation,
testing.
 Implementation of the system in the real
environment
 Resolution of the problem in the integration and
the test phase
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16. S.K.Ahsan

17. Deployment:
 The final stage of initial development, where the
software is put into production and runs actual
business.
 Deployment starts after the code is appropriately
tested, is approved for release and sold or
otherwise distributed into a production
environment.
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18. Maintenance
1- Corrective maintenance - To fix errors
2 -Adaptive maintenance - To add new
capability and enhancements
3- Perfective maintenance - To improve
efficiency
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19. SDLC – Advantages:
 Focus on goals
 Controls: milestones, checklist,
accountability
 Tools, models, CASE
 Hierarchical decomposition
 Designed for user & manager
involvement
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20. SDLC - Reasons for Failure:
 Scope too broad or too narrow
 Lack of needed skills
 Incomplete specifications
 No control/no framework
 Lack of management/user involvement
 Too time-consuming
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21. SDLC models:
 To over come the problems following models
were introduced:
1. Waterfall models.
2. Spiral models.
3. Iterative models.
4. JDA ( Joint Development Application )
5. RDA ( Rapid Development Application )
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