Use cases have become an important tool in software engineering. There has been much focus on the diagram notation but relatively little on use-case descriptions. As part of a welcome and important research project into the use of scenarios in requirements engineering, the CREWS (Co-operative Requirements Engineering With Scenarios, an EU funded ESPRIT project 21903) team has proposed a set of guidelines for writing use-case descriptions. This paper describes the replication of a CREWS project experiment that suggests CREWS usecase authoring guidelines improve the completeness of use-case descriptions. Our results show that the CREWS guidelines do not necessarily improve the use-case descriptions, only that the subjects implemented varying numbers of guidelines in their use-case descriptions. Subjects in the control group implemented a significant percentage of the guidelines by `chance.' To further justify our results, we also apply a different marking scheme to compare with the ...