Object Oriented Design

The Software Life Cycle

Formal processes have been established to help in the management of software projects.
A formal process identifies the activities and deliverables of different phases and gives guidelines on how to carry out the phases and when to move from one phase to the next.
An early (1970) formal development process called the waterfall method postulated that one phase would run until complete, its output would spill over to the next phase, and the next phase would begin.