Focuses on what must the system do, or characteristics it must have

• Goal is to convert high level bussness requirements into detail requirements that can be implemented

• Best determined by analyst and customers together

• Best to make changes no than later

• May not have access to the users

• Specifications may be lacking

• Not knowing the requirements at the start

• Verification and validation of requirements may be hard

• List of function and non functional requirements (prioritised tho not always necessary)

• Defines the scope

• Provides info needed in other stages development

• Verification from the user

A process or data the system must do or contain.

process oriented information oriented

Behavioural features the system must have (security, usability, speed)

operational performance security cultural political