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SDLC Models

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SoftwareTestingDiary

The document discusses several software development life cycle (SDLC) models including waterfall, iterative waterfall, V-shaped, RAD, incremental, spiral, and agile models. It also covers agile methods like Scrum and extreme programming. The document defines the capability maturity model (CMM) which measures an organization's software process maturity across five levels from initial to optimizing.

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Software Development Life Cycle (SDLC) Youve got to be very careful if you dont know where youre going, because you might not get there. SDLC Models
SDLC Model A framework that describes the activities performed at each stage of a software development project. Click to Read More SDLC Models.
Waterfall Model Requirements defines needed information, function, behavior, performance and interfaces. Design data structures, software architecture, interface representations, algorithmic details. Implementation source code, database, user documentation, testing. Click to Read More - Waterfall Model.
Iterative Waterfall Model Click to Read More Iterative Waterfall Model.
V-Shaped SDLC Model A variant of the Waterfall that emphasizes the verification and validation of the product. Testing of the product is planned in parallel with a corresponding phase of development Click to Read More V Model / V Shaped Model.
SDLC Models
RAD Model Click to Read More RAD Model.
Incremental SDLC Model Construct a partial implementation of a total system Then slowly add increased functionality The incremental model prioritizes requirements of the system and then implements them in groups. Each subsequent release of the system adds function to the previous release, until all designed functionality has been implemented. Click to Read More Incremental Model.
Spiral SDLC Model Adds risk analysis, and 4gl RAD prototyping to the waterfall model Each cycle involves the same sequence of steps as the waterfall process model Click to Read More Spiral Model.
Agile SDLCs Speed up or bypass one or more life cycle phases Usually less formal and reduced scope Used for time-critical applications Used in organizations that employ disciplined methods Click to Read More Agile SDLC Model.
Click to Read More Agile SDLC Model.
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)
Adaptive SDLC Combines RAD with software engineering best practices Project initiation Adaptive cycle planning Concurrent component engineering Quality review Final QA and release
Capability Maturity Model (CMM) A bench-mark for measuring the maturity of an organizations software process CMM defines 5 levels of process maturity based on certain Key Process Areas (KPA)
CMM Levels Level 5 Optimizing (< 1%) -- process change management -- technology change management -- defect prevention Level 4 Managed (< 5%) -- software quality management -- quantitative process management Level 3 Defined (< 10%) -- peer reviews -- intergroup coordination -- software product engineering -- integrated software management -- training program -- organization process definition -- organization process focus Level 2 Repeatable (~ 15%) -- software configuration management -- software quality assurance -- software project tracking and oversight -- software project planning -- requirements management Level 1 Initial (~ 70%)

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SDLC Models

  • 1. Software Development Life Cycle (SDLC) Youve got to be very careful if you dont know where youre going, because you might not get there. SDLC Models
  • 2. SDLC Model A framework that describes the activities performed at each stage of a software development project. Click to Read More SDLC Models.
  • 3. Waterfall Model Requirements defines needed information, function, behavior, performance and interfaces. Design data structures, software architecture, interface representations, algorithmic details. Implementation source code, database, user documentation, testing. Click to Read More - Waterfall Model.
  • 4. Iterative Waterfall Model Click to Read More Iterative Waterfall Model.
  • 5. V-Shaped SDLC Model A variant of the Waterfall that emphasizes the verification and validation of the product. Testing of the product is planned in parallel with a corresponding phase of development Click to Read More V Model / V Shaped Model.
  • 7. RAD Model Click to Read More RAD Model.
  • 8. Incremental SDLC Model Construct a partial implementation of a total system Then slowly add increased functionality The incremental model prioritizes requirements of the system and then implements them in groups. Each subsequent release of the system adds function to the previous release, until all designed functionality has been implemented. Click to Read More Incremental Model.
  • 9. Spiral SDLC Model Adds risk analysis, and 4gl RAD prototyping to the waterfall model Each cycle involves the same sequence of steps as the waterfall process model Click to Read More Spiral Model.
  • 10. Agile SDLCs Speed up or bypass one or more life cycle phases Usually less formal and reduced scope Used for time-critical applications Used in organizations that employ disciplined methods Click to Read More Agile SDLC Model.
  • 11. Click to Read More Agile SDLC Model.
  • 12. 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)
  • 13. Adaptive SDLC Combines RAD with software engineering best practices Project initiation Adaptive cycle planning Concurrent component engineering Quality review Final QA and release
  • 14. Capability Maturity Model (CMM) A bench-mark for measuring the maturity of an organizations software process CMM defines 5 levels of process maturity based on certain Key Process Areas (KPA)
  • 15. CMM Levels Level 5 Optimizing (< 1%) -- process change management -- technology change management -- defect prevention Level 4 Managed (< 5%) -- software quality management -- quantitative process management Level 3 Defined (< 10%) -- peer reviews -- intergroup coordination -- software product engineering -- integrated software management -- training program -- organization process definition -- organization process focus Level 2 Repeatable (~ 15%) -- software configuration management -- software quality assurance -- software project tracking and oversight -- software project planning -- requirements management Level 1 Initial (~ 70%)