LONGITUDINAL RESEARCH AND MARIJUANA SMOKING A Successful Approach

This paper reports on specific methods that were used in a longitudinal study in which 94% of the subjects cooperated at the time or at recontact after a two‐year interval. The probable factors responsible for this success are described, including details regarding the preparation prior to the study, approaching the subject, establishing rapport at initial contact, and the maintenance of rapport throughout the study. It is hoped this description will encourage others to provide similar reports on their methods and be helpful to those pursuing comparable research.