Waterfall Model

Waterfall include following steps: Requirements, design, implementation, testing and integration and maintenance. Waterfall model cannot be tracked back. It is used for large projects. It was purposed by computer scientist Winston Walker Royce in 1970.

Incremental Model

Incremental model consists of following steps: Requirement, Specification, Architectural design, Implementation, Maintenance and retirement. It is combination of undeviating and iterative model. It can straightforwardly accept change. It was purposed by IEEE in 2003 due to defects in waterfall model. As waterfall is not suitable for all models

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