V-Model

V-Model

• Developed to address some of the problems of waterfall model
• Provides guidance that testing needs to begin as early as possible in the SDLC
• Testers work in parallel with development activities
• Illustrates how testing activities can be integrated into each phase of SDLC
• Work products produced by developers and business analysts are basis for testing that are used in different levels of testing
• Usually 4 levels of testing : unit testing, Integration testing, System testing, Acceptance testing
• Provides a mapping between development stages and testing stages

Verification:

• Are we building the project right?
• It is concerned with Phase containment of errors

Validation:

• Are we building the right product?
• It is concerned with the final product being error-free

Advantages

•  Simple and easy to use
• Each phase has well defined deliverables
• Rework time is lesser compared to waterfall model due to test plans that arrive at early in the life cycle

Disadvantages

• Very rigid like water fall model