A sample of recent thinking in international relations theory, World Politics, October 1961, is offered also in a special hard-cover edition. Contributors: M.A. Kaplan, A.L. Burns, T.C. Schelling, R.E. Quandt, J.D. Singer, S. Verba, G. Modelski, F.W. Riggs, C. McClelland, S. Hoffmann.