* Professor Azar benefitted from a Kenan leave during the Fall of 1977 and received much support from the Department of Political Science and the Institute for Research in Social Science at the University of North Carolina at Chapel Hill. Professor Cohen benefitted from the support given him by the Center ‘for International Affairs and the Department of Psychology at Harvard University. Both authors appreciate the support given by these institutions. Furthermore, the authors thank their colleagues Herbert Kelman, Harvard, Samir Anabtawi, Vanderbilt, and Hussein Tuma, NIH for their constructive criticisms and support.