Waterfall model phases
l Requirements analysis and definition l System and software design l Implementation and unit testing l Integration and system testing l Operation and maintenance l The drawback of the waterfall model is the difficulty of accommodating change after the process is underway
©Ian Sommerville 2000 Software Engineering, 6th edition. Chapter 1 Slide 9
Waterfall model problems
l Inflexible partitioning of the project into distinct stages l This makes it difficult to respond to changing customer requirements l Therefore, this model is only appropriate when the requirements are well-understood