The advantage of waterfall developm

The advantage of waterfall development is that it allows for departmentalization and
control. A schedule can be set with deadlines for each stage of development and a
product can proceed through the development process model phases one by one.
Development moves from concept, through design, implementation, testing, installation,
troubleshooting, and ends up at operation and maintenance. Each phase of development
proceeds in strict order.
The disadvantage of waterfall development is that it does not allow for much reflection or
revision. Once an application is in the testing stage, it is very difficult to go back and
change something that was not well-documented or thought upon in the concept stage.