Various Software Life Cycle Models

What is Software Development Life Cycle (SDLC)?

The various activities that are undertaken when developing software are commonly modelled as a software development lifecycle. The software development lifecycle begins with the identification of a requirement for
software and ends with the formal verification of the developed software against that requirement.

The software development lifecycle does not exist by itself; it is in fact part of an overall product lifecycle. Within the product lifecycle, software will undergo maintenance to correct errors and to comply with changes to requirements. The simplest overall form is where the product is just software, but it can become much more complicated with multiple software developments, each forming part of an overall system to comprise a product.

There are a number of different models for software development lifecycles. Some of the more commonly used models are:

-> Waterfall Lifecycle Model/ Linear Sequential/ Classic Life Cycle Model
-> Modified Waterfall Lifecycle Model
-> V Lifecycle Model
-> Progressive Development Lifecycle Model
-> Iterative / Incremental Lifecycle Model
-> Spiral Lifecycle Model
-> Prototyping Model
-> RAD Lifecycle Model
-> Evolutionary Model
-> Fish Model
->Fourth Generation (4GT) Techniques