Primary objective of this lecture is to presentation on Use Cases. Use cases is a written descriptions of user’s interaction with all the software product to accomplish an objective. Use cases are the methods a system can be taken and it help all of us discover/document requirements. Here briefly discuss on benefits of doing use cases and Cockburn’s requirements list. Finally explain qualities of a good use cases, this process starts with a request from an actor to the system and ends with the production of all the answers to the request.