A use case analysis is the most common technique used to identify the requirements of a system (normally associated with software/process design) and the information used to both define processes used and classes (which are a collection of actors and processes) which will be used both in the Use case diagram and the overall Use case in the development or redesign of a software system or program. The use case analysis is the foundation upon which the system will be built.
Reference:
http://en.wikipedia.org/wiki/Use-case_analysis
Reference:
http://en.wikipedia.org/wiki/Use-case_analysis
