The purpose of my remarks is to draw some conclusions about the conditions which must be realized if physical, biological and social scientists are to work effectively in reaching common goals. I shall draw these conclusions on the basis of my experience as a psychologist whose participation in the war effort found him a member of a team composed principally of physicists and research engineers. I may say that while my experiences were largely at the level of the lower echelons of the working fraternity, the conclusions appear to me to have application without regard to the extent of the brass which, in a figurative sense, decorates the scientist's hat.