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Software Development Life Cycle (SDLC). Manoj V. Nikum Ahinsa Polytechnic,Dondaicha. Software Development Life Cycle. Systems development life cycle (SDLC) ‏ Provides overall framework for managing systems development process Two main approaches to SDLC

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software development life cycle sdlc
Software Development Life Cycle (SDLC)

Manoj V. Nikum

AhinsaPolytechnic,Dondaicha

software development life cycle
Software Development Life Cycle
  • Systems development life cycle (SDLC)‏
    • Provides overall frameworkfor managing systems development process
  • Two main approaches to SDLC
    • Predictive approach– assumes project can be planned out in advance
    • Adaptive approach– more flexible, assumes project cannot be planned out in advance
  • All projects use some variation of SDLC
working of sdlc
Working of SDLC
  • Systems analysis, requirements definition: Defines project goals into defined functions and operation of the intended application. Analyzes end-user information needs.
  • Systems design: Describes desired features and operations in detail, including screen layouts, business rules, process diagrams, pseudo code and other documentation.
  • Development: The real code is written here.
  • Integration and testing: Brings all the pieces together into a special testing environment, then checks for errors, bugs and interoperability.
  • Acceptance, installation, deployment: The final stage of initial development, where the software is put into production and runs actual business.
  • Maintenance: What happens during the rest of the software's life: changes, correction, additions, moves to a different computing platform and more. This is often the longest of the stages.
sdlc model
SDLC Model
  • A framework that describes the activities performed at each stage of a software development project.
  • There are various software development approaches defined and designed which are used/employed during development process of software, these approaches are also referred as "Software Development Process Models".
waterfall strengths
Waterfall Strengths
  • Easy to understand, easy to use
  • Provides structure to inexperienced staff
  • Milestones are well understood
  • Sets requirements stability
  • Good for management control (plan, staff, track)
  • Works well when quality is more important than cost or schedule
waterfall deficiencies
Waterfall Deficiencies
  • All requirements must be known upfront
  • Deliverables created for each phase are considered frozen – inhibits flexibility
  • Can give a false impression of progress
  • Does not reflect problem-solving nature of software development – iterations of phases
  • Integration is one big bang at the end
  • Little opportunity for customer to preview the system (until it may be too late)
when to use the waterfall model
When to use the Waterfall Model
  • Requirements are very well known
  • Product definition is stable
  • Technology is understood
  • New version of an existing product
  • Porting an existing product to a new platform.
other models
Other Models
  • COCOMO Model
  • Rapid Application Development (RAD)
  • Phased Model
  • Prototyping SDLC
  • Throwaway Prototyping Model
some agile methods
Some Agile Methods
  • Adaptive Software Development (ASD)
  • Feature Driven Development (FDD)
  • Crystal Clear
  • Dynamic Software Development Method (DSDM)
  • Rapid Application Development (RAD)
  • Scrum
  • Extreme Programming (XP)
  • Rational Unify Process (RUP)
strength weakness of sdlc
Strength & Weakness of SDLC

Strength

  • Control
  • Monitor Large Projects
  • Detailed Steps
  • Easy To Maintain

Weakness

  • Increased Development Time & Cost
  • Rigidity
  • Hard To Estimate Project Overruns
conclusion
Conclusion
  • Without an SDLC Model to follow, developers can have a free hand of developing software. There are so many programs out there that were created with a vision of need instead of following a certain model.
  • On the other hand SDLC will ensure everything is laid out. Businesses will have a clear idea of what will happen and what is expected from a software.
  • Maintenance and development of the software is also possible since parts could be possibly be reused in different programs.