Members of the study group were: Low Energy Colliders: D. Atwood, H. Baer, G. BClanger, A. Blondel, M. Chen, G. Couture, J. Grifols, P. Grosse-Wiesemann, C. Heusch, B. Irwin, D. London, P. McBride, A. Mendez, U. Nauenberg, J. Robinson, R. Schindler, S. Sugimoto, X. Tata, R. Zhu; High Energy Colliders: J. Alexander, H. Baer, C. Baltay, T. Barklow, P. Burchat, D. Burke, C. Dib, K. Gan, J. Gomez-C...