Hypothectical constructs have been classified in two groups - perceptual constructs and learning constructs. The first delas with with the way the individual perceives and responds to the information from the input variables, accounting for stimulus ambiguity and perceptual bias. The second deals with the stages from the buyer motives to his satisfaction in a buying situation.The purchase intention is an outcome of the interplay of buyer motives, choice criteria, brand comprehension, resultant brand attitude and the confidence associated with the purchase decision. The motives are general or specific goals impelling to action, impinging upon the buyer intention are also the attitudes about the existing brand alternatives in the buyer's evoked set, wich result in an arrangement of an order of preference regarding brands. Brand comprehension and the degree of confidence that the buyer has about it, choice criteria and buying intentions, converge upon the inetention to buy.