(Figure: Waterfall Model)
- When requirements for a problems are well understood then this model is used in which work flow from communication to deployment is linear
- This Model also called as the Classic life cycle or linear sequential model.
- When to use ?
- Requirements are very well known, clear and fixed
- Product definition is stable
- Technology is understood
- There are no ambiguous (unclear) requirements
- Ample (sufficient) resources with required expertise are available freely
- The project is short
- Advantages
- Simple to implement and manage
- Drawbacks
- Unable to accommodate changes at later stages, that is required in most of the cases.
- Working version is not available during development. Which can lead the development with major mistakes.
- Deadlock can occur due to delay in any step.
- Not suitable for large projects
