As the capstone of Penn's practice-integrated mechanical engineering curriculum, the two-semester senior design sequence challenges students to bring theory, skills, general knowledge, and inventive energy to bear on substantial engineering problems. There is no "typical" project and the variety is always surprising: some projects lead to marketable products, some explore a theoretical principle, and some are just for fun. But taken together, they reflect the breadth and diversity of mechanical engineering. The culmination of the two-semester senior design sequence is the senior design report.