What are use cases?

–Use-cases are a scenario based technique in the um-l which identify the actors in an interaction and which describe the interaction itself.–A set of use cases should describe all possible interactions with the system.–Sequence diagrams may be used to add detail to gyuse cases by showing the sequence of event processing in the system. Source:http://en.docsity.com/en-docs/Requirements_Engineering_Process-Softwarre_Engineering-Lecture_Slides_

"Employ instances ar building complex to write and to recognize, intended for both prospects along with designers. "