tailieunhanh - addison wesley writing effective use cases phần 4

Tham khảo tài liệu 'addison wesley writing effective use cases phần 4', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 5. Three Named Goal Levels Page 73 - Subfunctions indigo black underwater clam The outermost use cases revisited Earlier I recommended that you write a few outermost use cases for whatever system you are designing. Here is the more precise description of finding those use cases. 5 Start with a user goal. 6 Ask what preferably outside the organization primary actor AA does this goal really serve Actor AA is the ultimate primary actor of the use cases that we are about to collect. 7 Find the outermost design scope S such that AA is still outside S. Name the scope S. I typically find three such outermost design scopes the company the software systems combined the specific software system being designed. 8 Find all the user goals having ultimate primary actor AA and design scope S. 9 Work out the summary goal GG that actor AA has against system S. 10 Finally write the summary use case for goal GG of actor AA against system S. This use case ties together a number of your sea-level use cases. All told there are usually only about four or five of these topmost use cases GG even in the largest systems I have been associated with. They summarize the interests of three or four ultimate primary actors AA the customer as outermost primary actor to the company the marketing department as outermost primary actor to the software systems combined the security department to the software system itself. These outermost use case are very useful in holding the work together and I highly recommend writing them for the reasons given earlier. They will not however provide your team with the functional requirements for the system to be built. Those reside in the user goal blue use cases. Subfunctions indigo black underwaterX3 clam Subfunction-level goals are those required to carry out user goals. Include them only as you have to. They are needed on occasion for readability or because many other goals use them. Examples of subfunction use cases are Find a product Find a .

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