In an effort to promote the maximum rate of technical progress toward clean air objectives, the Alternative Automotive Power Systems Division holds periodic coordination and progress meetings with all of its contractors, staff, consultants, prospective contractors, and selected guests. The meetings focus attention on the status of the programs and provides an opportunity for interaction between the participants on problem areas of mutual interest. The presentations and discussions at the seventh such meeting held on May 13-16, 1974, in Ann Arbor, Michigan are summarized, including: (1) the key issues under consideration in the AAPS Division; (2) the Gas Turbine Engine Program; (3) the Rankine Cycle Engine Programs; (4) the Diesel Engine Study, Alternative Fuel Investigations, Combustion Studies, Electric Vehicle Impact Study, and Hydrogen Storage Investigations. Wherever possible specific data, principle conclusions, and key illustrations are included. Additional supplementary material contained in the appendices include explanatory notes on the AAPS Division in the EPA organization (Appendix A), a list of attendees and representatives (Appendix B), a review of the background and evolution of the new EPA Highway Test Cycle (Appendix C), a final report on the health hazards of nickel oxide regenerator seal materials (Appendix D), and a bibliography of AAPSD reports released through May 1974 (Appendix E).