QA Software Development Life Cycle

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1. Waterfall SDLC.
2. Agile SDLC.
3. V-Model SDLC.
4. Hybrid SDLC.

1. Waterfall SDLC.

Waterfall Software Development Life Cycle (SDLC) is old model focuses on structured and well documented software development process. It is non-iterative approach allowing multiple projects to run in parallel. Waterfall SDLC falls into following catagories.

Requirement

    Design
 
     Development
 
        Testing
 
         Acceptance
 
           Maintenance

2. Agile SDLC.

Agile Software Development Life Cycle (SDLC) follows an adaptive, fast process approaches. It consists of multiple iteration usually (1-4 weeks). Iteration 1 Design Development Test Iteration 2 Design Develop Test Iteration 3 Design Develop Test Iteration 4 Design Develop Test
3. V-Model SDLC.

V-Model Software Development Life Cycle (SDLC) is also structured, well documented and discipline which is a rigorous and measurable processes. It is predictive and largely used by complex projects:

Requirement Analysis                                      Acceptance
                                Testing
         System Design                                       System
                            Testing
            Architecture
         Design                             Integration
                        Testing
                     Model Design              Unit Testing
                                                
                  Development 

4. Hybrid SDLC.

Hybrid Software Development Life Cycle (SDLC) is an approach that companies are adapting hybrid of Waterfall and V-Model or Agile software development process that suits their environment. Within the same company, one team or product line is following a particular process whereas others following different processes. This could happen when companies are likely to transitioning from one model to another model.