Separating markets precisely and applying marketing programs proportional to the known sections is one of the most important success tools in competitive markets. Having 24 million young people aged 15-29 (32% of total population), Iran has a young demographic structure. Concerning this demographic structure, exact recognition of CDMS of Iranian young consumers is of great importance for salespeople. Thus, this research seeks to study decision-making styles among students of shahidbeheshti university of Tehran. To validate fundamental features of these styles among Iranian young people, the CSI Model presented by Sproles and Kendal (1986)