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The difficulty shows up as soon as you start to write your first use case. These three concepts are: * Scope. What is really the system under discussion? * Primary actor. Who has the goal? * Level. How high- or low-level is that goal? This part of the book covers these concepts at length, along with the other elements of the use case: action steps, scenarios, preconditions and guarantees, alternate flows, and technology and data variations. While reading, hang onto these summary definitions: * An actor is anyone or anything with behavior.

We can fold a set of sequences into a single statement. " As with sequences, we can fold them into brief, high-level descriptions, or unfold them into detailed descriptions, to suit our needs. So far, we have seen that a use case contains the set of possible scenarios for achieving a goal. To be more complete, we need so add that • All the interactions relate to the same goal of the same primary actor. • The use case starts at the triggering event, and continues until the goal is delivered or abandoned, and the system’s completes its responsibilities with respect to the interaction A use case collects scenarios The primary actor has a goal; the system should help the primary actor reach that goal.

The two systems must co-exist and synchronize with each other. Use cases have to be written for both systems, system Acura being entirely new, and system BSSO being modified to synchronize with Acura. 51 Chapter 3. Scope Design scope - Page 52 The difficulty in this situation is that there are four use cases, two for Acura and two for BSSO. There is one use case for each system having the clerk as primary actor, and one having the other computer system as the primary actor. There is no way to avoid these four use cases, but people looking at them get confused.

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BusinessWriting Effective Use Cases Cockburn

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