Preface / Philip Morrison -- I. Consensus -- II. Colloquies. Cosmic evolution / Ichtiaque S. Rasool, Donald L. De Vincenzi, and John Billingham -- Cultural evolution / Mark A. Stull -- Detection of other planetary systems / Jesse L. Greenstein and David C. Black -- The rationale for a preferred frequency band : the water hole / Bernard M. Oliver -- Search strategies / Charles L. Seeger -- The science of SETI / David C. Black and Mark A. Stull -- III. Complementary documents. Alternative methods of communication / John H. Wolfe -- Notes on search space / Charles L. Seeger -- Parametric relations in a whole sky search / Bernard M. Oliver -- Stellar census / Charles L. Seeger -- Summary of possible uses of an interstellar search system for radio astronomy / Jeffrey N. Cuzzi and Samuel Gulkis -- SETI related scientific and technological advances / David C. Black and Mark A. Stull -- A preliminary parametric analysis of search systems / Roy Basler -- Radio frequency interference / Mark A. Stull and Charles L. Seeger -- Protection of a preferred radio frequency band / Mark A. Stull -- Responses to a questionnaire sent to leading radio observatories / Philip Morrison -- The Soviet CETI report -- Searches to date -- The maintenance of archives / Charles L. Seeger