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Writing Effective Use Cases Alistair Cockburn
Publisher: Addison-Wesley Professional

They are especially useful when the system of interest is in turn composed of other subsystems. A Use Case Driven Approach, revised printing, Addison-Wesley 1993. Very systematic and logical approach, clear and easy to understand guidelines for writing, quite good examples. You can also apply formatting to text for emphasizing key ideas. You can write down the steps there, with or without conditional flow. Having tried 'Use Cases: Requirements in Context' and 'Managing Software Requirements: A Use Case Approach' I can tell you this is the book to really understand. The flow of events editor is in tabular form, with each row representing a step of use case. So the more system functions you draw in a use case diagram, the less effective the use case model can be used to express users' real expectation throughout the entire software development process. The book describes the methodology of putting the software requirements in written through the use cases. Therefore, when Use case flow of events. Cockburn, Alistair, Writing Effective Use Cases, Addison-Wesley, 2001. Write good use cases to design and develop a stable system.