The Harward Sheth model summarizes the buying behavior of organizations with 2 or more individuals making decisions jointly. It highlights 3 levels of decision making: extensive problem solving when buyers have little information; limited problem solving when criteria is defined but options exist; and routinized response behavior when strong brand positioning exists. The model uses inputs like significant, symbolic, and social stimuli that provide information to buyers and examines outputs. It also considers perceptual and learning constructs central to buyers' decision making processes. While the model effectively incorporates behavioral sciences, some variables are not well-defined or easy to measure, and it is complex.