Аннотация

Abstract  Use cases are the main requirements vehicle of the UML and are used widely to specify systems. Hence, the need to write clearand accurate use case descriptions has a significant impact for many practitioners. However, many have pointed to weaknessesin the support offered to those writing use cases, and a number of authors advocate the use of rules in the composition andstructuring of use case descriptions. These rules constrain the user, by only allowing certain grammatical constructions,typically guiding the structure or the style of the description For example, the CREWS research project pioneered Use CaseAuthoring Guidelines, suggesting that the adoption of such guidelines improved resulting use case descriptions. Replicationof CREWS studies appeared to confirm the view that use case descriptions were improved through the application of guidelinesets, but also noted that learning such rules presented a significant overhead. Hence, a leaner set of guidelines (the CPrules) was developed.

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