UMLint: Identifying Defects in UML Diagrams

We present UMLint, an automated tool for detecting defects i n UML diagrams. This tool is designed to improve object-oriented models developed by students. Standard tools such as IBM Rational Rose provide little feedback on model qualit y, so students must rely on feedback from instructors. Often there is a significant dela y between completing a diagram and getting this feedback, resulting in missed lear ning opportunities. UMLint addresses this issue by identifying common defects, hopefu lly ncouraging students to look more deeply for other defects. UMLint is available as a w eb service to allow use by both students and the community at large. This paper present s the checks made by UMLint, suggests possible future directions, and invites d iscussion about what standards should be expected of student-created models.