Because parents have a major impact on their preschool children's development, the study of parental attitudes is crucial to understanding substance abuse behavior. This study examined the reliability of an instrument to measure attitudes of parents with preschool children regarding substance use and abuse. The sample consisted of a lower to middle socioeconomic, racially diverse population of 101 parents of preschool children. The Parent Attitude Assessment Instrument (PAAI) measured parents' attitudes toward substance use and abuse, parental role modeling, and substance abuse prevention with preschool children.