2. INTRODUCTION: A Software Development Life Cycle (SDLC) isany
logical process used by a systems analyst todevelop an information
system, includingrequirements, validation, training, and
user(stakeholder) ownership A framework that describes the
activitiesperformed at each stage of a softwaredevelopment
project.S.K.Ahsan 3. WHY DO WE NEED SDLC? SDLC has made the
development of softwaremore easy than earlier. Because software can
be very difficult andcomplex. SDLC works as a framework to guidethe
development to make it more systematic andefficient. By SDLC we
will be able to tell how long it willtake to complete the project,
to test and deploy.S.K.Ahsan 4. SDLC Characteristics: Disciplined
approach Systems approach Iterative (not sequential)
CyclicalS.K.Ahsan 5. SDLC PHASESS.K.Ahsan 6. SDLCPHASESS.K.Ahsan 7.
SDLCPHASES Initialization Planning Requirement Analysis Design
Development Integration and testing implementation Deployment
MaintenanceS.K.Ahsan 8. Initiation & feasibility:Project
objectives & ScopePreliminary survey &
feasibilityTechnicalEconomicOperationalProject proposal and
scheduleIdentify assumptions &constraintsS.K.Ahsan 9.
Initiation & feasibility:S.K.Ahsan 10. Planning: Develops a
project management plan and otherplanning documents. Provides the
basis for acquiring the resourcesneeded to achieve a
solution.S.K.Ahsan 11. Requirement Analysis: defines needed
information, function,behavior, performance and interfaces.
Analyses user needs and develops userrequirements Create a detailed
functional requirementsdocument. Refines project goals into defined
functions andoperation of the intended application. Analyzes
end-userinformation needs.S.K.Ahsan 12. Design: data structures,
software architecture,interface representations,
algorithmicdetails. Transform detailed requirement intocomplete,
detailed systems designdocument focuses on how to deliver
therequired functionality. System design Describes desired features
andoperations in detail, including screen layouts,business rules,
process diagrams, pseudo codeand other documentation.S.K.Ahsan 13.
Development: Implementation is the part of the process
wheresoftware engineers actually program the code forthe project.
Converts a design into a complete informationsystem includes
acquiring and installing systemsenvironment; creating and testing
databasespreparing test case procedures ;preparing testfiles,
coding compiling, refining programs.S.K.Ahsan 14. Integration and
testing: Brings all the pieces together into a specialtesting
environment, then checks for errors, bugsand interoperability.
Software testing is an integral and important partof the software
development process. This part ofthe process ensures that bugs are
recognized asearly as possible. Documenting the internal design of
software forthe purpose of future maintenance andenhancement is
done throughout development.S.K.Ahsan 15. Implementation: source
code, database, user documentation,testing. Implementation of the
system in the realenvironment Resolution of the problem in the
integration andthe test phaseS.K.Ahsan 16. S.K.Ahsan 17.
Deployment: The final stage of initial development, where
thesoftware is put into production and runs actualbusiness.
Deployment starts after the code is appropriatelytested, is
approved for release and sold orotherwise distributed into a
productionenvironment.S.K.Ahsan 18. Maintenance1- Corrective
maintenance - To fix errors2 -Adaptive maintenance - To add
newcapability and enhancements3- Perfective maintenance - To
improveefficiencyS.K.Ahsan 19. SDLC Advantages: Focus on goals
Controls: milestones, checklist,accountability Tools, models, CASE
Hierarchical decomposition Designed for user &
managerinvolvementS.K.Ahsan 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-consumingS.K.Ahsan 21. SDLC models: To over
come the problems following modelswere introduced:1. Waterfall
models.2. Spiral models.3. Iterative models.4. JDA ( Joint
Development Application )5. RDA ( Rapid Development Application
)S.K.Ahsan
