ITHIN the behavioral sciences, most research assumes that V rationality is a commonly shared attribute of mankind -that the defining characteristic of humans is their ability to examine alternatives, estimate their consequences, and then select one which allows them to achieve their goals. While pure rationalitywith its assumptions of perfect information, a complete set of preference orderings, and unlimited computational abilityhas been subjected to devastating criticism, even theories of bounded rationality assume that subjects obtain reasonably accurate information concerning the more important consequences of a few alternatives before making decisions