Water fall model

IMP for Software Project Management

Waterfall Model

The waterfall model was first defined by Winston W. Royce in 1970 and has been widely used for software projects ever since.  Royce's original model is shown on the right.

1. It is classical model that is also known as the one shot model or once through model.
2. Sequence of activity "Top - Bottom".
3. Favored by some managements because it creates natural milestones at the end of each phase.
4. It was the first model which was introduce in 1970 and still widely used in Software Engineering.
5. Divided into several separate process phase.
6. All the methods and processes undertaken in waterfall model are more visible.
7. Various Software Development approaches define and designed which are used durig develpoment process of software. 

                                                  - " Software Development Process Model "

"PROJECT" and "PROJECT CHARACTERISTICS"

The word PROJECT comes from the Latin word PROJECTUM from the Latin verb PROICERE; which means “to throw something forwards” which in turn comes from PRO-, which denotes something that precedes the action of the next part of the word in time and ICERE, “to throw”. The word PROJECT thus actually originally meant “something that comes before anything else happens”.


 

A project in business and science is a temporary endeavor undertaken to create a unique product, service, or result. Basically, it is planned to achieve a particular aim. The aim of a project is to attain its objective and then terminate. Some of the reasons to start a project can be:

• A customer request or market demand
• An organizational need
• A customer request
• A technological advance
• A legal requirement

Projects and operations differ primarily in that operations are ongoing and repetitive, while projects are temporary and unique. Generally, a project is a means of organizing some activities that cannot be addressed within the normal operational limits.

Project characteristics: 

• It is temporary – temporary means that every project has a definite beginning and a definite end. Project always has a definitive time frame.
• A project creates unique deliverables, which are products, services, or results.
• A project creates a capability to perform a service.
• Project is always developed in steps and continuing by increments – Progressive Elaboration.