Requirements Analysis of a System

It is clear @WebOL that innovation also means business, not only technology : read posts in IT + Eco categories. Here are many links & quotes from Wikipedia (worth reading for this realm at least) :

– A use case is a description of a system’s behaviour as it responds to a request that originates from outside of that system. Use cases describe the interaction between a primary actor—the initiator of the interaction—and the system itself, represented as a sequence of simple steps. Actors are something or someone which exist outside the system under study, and that take part in a sequence of activities in a dialogue with the system, to achieve some goal: they may be end users, other systems, or hardware devices. Each use case is a complete series of events, described from the point of view of the actor
– A Business analysis provide typical deliverables. Business Requirements are a specification of what the business wants. This is usually expressed in terms of broad outcomes the business requires, rather than specific functions the system may perform.

  • Functional requirements. It describes what the system, process, or product/service must do in order to fulfill the business requirement(s). Note that the business requirement often can be broken up into sub-business requirements and many functional requirements. These are often referred to as System Requirements.
  • Non-Functional requirements, which cannot be met by a specific function (e.g. performance, scalability, security and usability requirements). These are often included within the System Requirements, where applicable.
  • Put another way, thanks to 3SL featuring an interesting page on Non-Functional requirements, User requirements are statements of user need, as expressed by the groups of stakeholders concerned with the system being developed.

ISO 9126, international standard for the evaluation of software quality.


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