Not only can differences in the consumption preferences be a result of the influence of some attributes of the store and the style of attendance given to the consumer, but they can also happen as a consequence of the last experiences or personal values of the individual. The correct perception of the effects that influence purchasing preferences brings positive skills to marketing due to a better knowledge of consumers, which promotes a more adequate communication with the market, maximizing marketing efforts´results. Cohort - a group of individuals that had grown in the same environment, with similar life experiences - is defined by the conditions that have continuously happened during critical periods in its members´life. Through the analysis of cohort in the customers´attitudes of purchase, it is possible to identify the influence of belonging to a group on the purchasing behavior. In this study, the analysis of cohort is applied to the supermarket industry. Therefore, it will provide that industry a better understanding of its consumers´purchasing attitudes, making it easier to approach them with a higher level of effectiveness.