Ivar Jacobson

"The control objects model functionality that is not naturally tied to any other object... We do not believe that the best systems are built by only using objects that correspond to real-life entities,…"

"A is a complete course of events in the system, seen from a user’s perspective."

"People regard their environment in terms of objects. Therefore it is simple to think in the same way when it comes to designing a model."

"The analysis model will not be a reflection of what the problem domain looks like... The reason is simply to get a more maintainable structure where changes will be local and thus manageable. We thus …"

"When a user uses the system, she or he will perform a behaviorally related sequence of transactions in a dialogue with the system. We call such a special sequence a use case."

"The is a general-purpose visual modeling language that is used to specify, visualize, construct, and document the artifacts of a software system. It captures decisions and understanding about systems …"