This paper chronicles the effort of a curriculum development team to alter the high school social studies curriculum, its content, and instructional methods. Specifically, Entrepreneur/Economic Education (E-3) is the focus of this curriculum reform effort. The E-3 program is designed as a four-year cooperative effort involving selected teachers, administrators, and students in the School District of Philadelphia, the Center for Private Enterprise at Baylor University, Widener University's Center for Economic Education, and the Pew Charitable Trusts. Teacher education courses allow collaboration between teachers and the curriculum development team. E-3 is designed to have a major impact on the lives of students chosen to participate in the program. It also reaches non-participants by infusing special units into the ninth and tenth grade social studies curriculum. Selected students enroll in an 11th-grade entrepreneurship elective course comprised of economic concepts, principles, and analysis of private and public entrepreneurial activities. Summer internships give students the opportunity to work with individuals engaged in entrepreneurial activities. The 12th-grade course combines macroeconomic understanding with the development of a plan to start a venture of their own. Student development and presentation of a business plan requires application of knowledge gained from their courses and internships, and provides practical experience in planning for a venture. The program is based on the principle that curriculum change and implementation in classrooms is best accomplished through the collaborative efforts of those affected by change. Attempts are being made to establish E-3 in school districts throughout the nation. (GEA)