This evaluation paper discusses the design of a new six week course in the Cooper Union Summer science, technology, engineering, and math (STEM) Program for high school students. Existing courses in the program focused on a single engineering discipline (electrical, chemical, mechanical, or civil) with well-defined projects chosen by the professor. The new course focused on open-ended engineering design and multidisciplinary entrepreneurship. Most courses at the high school level utilize a clear design goal so that students can spend their time in design of a solution and construction. However, there are clear advantages to introducing open ended design to students earlier, including addressing the ABET Criteria parts e) an ability to identify, formulate, and solve engineering problems and h) the broad education necessary to understand the impact of engineering solutions in a global, economic, environmental, and societal context. It has also been shown that students' intrinsic motivations in the design of a project can inspire further engagement in engineering. The procedure for creating the course materials and methods of instruction are discussed, as well as student project results and a qualitative and quantitative assessment of the course.