After accepting a software proposal, the corresponding project managers should one of the available 5 sdlc model to follow in the development cycle.

There are 5 SDLC models available currently.They are

  1. Waterfall Model
  2. Prototype Model
  3. Incremental Model
  4. Spiral Model
  5. V-Model

Waterfall Model: When the customer requirements are clear and complete

Requirements Gathering—>Analysis & Planning—> Design—> Coding—> Testing—> Release & Maintenance

Prototype Model: When the customer requirements are unclear and confusing

Incremental Model: When the customer requirements are clear but not complete, because client is giving requirements in installment basis.

Spiral Model: When the customer requirements are clear and complete but enhancing in future

Note: In above 4 SDLC models the testing is available as one stage and the stage was also conducted by same developers.Due to this the organizations are concentrating on multiple stages of testing and separate testing teams for quality software development.

V-Model: V- stands for Verification and Validation

  • It is a recognized model by organizations
  • This model defines the mapping in between multiple stages of development and multiple stages of testing

To decrease project cost,the organizations are maintaining the separate testing team only for system testing. Because the system testing stage is working as bottle neck stage in software development.