REQUIREMENT gathering is an ART rather than a science. FIRST it depends upon at what level you are talking about. Generally speaking, requirements gathering follows Top-Down Approach. It also depends upon your level in the SDLC cycle. There are different ways of gathering requirements. Generally accepted METHODS are:

1. Intereviewing Techniques.
2. Case Study methods.
3. Joint Application Development Method.
4. Application Explorer method.
5. Brain Stroming approach,etc.

There are also different tools used for requirement gathering like, UML, RATIONAL Rose, Microsoft Visio, Recruitment Matrix,etc.

Requirement gathering is an art rather than a science. First it depends upon at what level you are talking about. Generally speaking, requirements gathering follows Top-Down Approach. It also depends upon your level in the SDLC cycle. There are different ways of gathering requirements. Generally accepted methods are:

There are also different tools used for requirement gathering like, UML, Rational Rose, Microsoft Visio, Recruitment Matrix,etc.