Software analysts create many artifacts, and until recently, these have been cumbersome to reuse. REUSER is a CASE (computer-aided software engineering) tool that lets analysts automatically retrieve related artifacts for reuse. Evaluations of REUSER suggest that its approach to UML artifact reuse is effective. Moreover, its underlying graph-based concept clustering technique has repeatedly performed well in structured domains. In this article, the authors report on its effectiveness in assisting analysts to reuse UML sequence diagrams.