Waterfall (Traditional)

Waterfall is another, more traditional form of project management that is popular outside of software development, in industries such as manufacturing and construction. With the waterfall methodology, the client is consulted during the planning stage to break the project into sequential phases.

The phases in waterfall are staggered, where the end of each phase is marked with a milestone, and the next phase does not start until the previous phase was completed.

Unlike agile, the waterfall method doesn’t allow previous phases to be revisited.