Waterfall Model (Linear Sequential Life Cycle Model)
Waterfall is one of the oldest models that can be used not only for the software testing needs. Its basic principle is a sequential order of steps. It means that we can move to the next step of development or testing process only after the previous step was completed successfully.
This model is applicable for small projects only in case if all requirements are clearly defined.
Advantages of Waterfall Methodology
Cost-effectiveness
Waterfall model is simple to implement,and the amount of resources required for it are minimal.
All the testing and modification is done is the same phase, chances of defect multiplication reduced
The project with short span time can be developed with this model in better quality.