The present paper describes a conceptual model of possible antecedents, markers, and consequences of unpredictability schemas, and outlines empirical support for the model. Early experiences, especially those pertaining to one's family, are the basis for the development of an unpredictability schema. To date, an unpredictability schema has been measured indirectly with scales that tap a variety of interrelated beliefs. Measures of such beliefs show associations with risk taking. An unpredictability schema, thus, may be an overlooked factor in risk-taking behavior. The present model takes a multidisciplinary approach and makes two major contributions. First, it integrates psychological constructs that have not previously been linked. Second, it clarifies existing relationships among background characteristics and riskrelated outcomes. Implications for prevention and intervention programming are discussed.Research suggests an association between several aspects of risk-taking and background characteristics such as socioeconomic status (SES). Little is known about the mechanisms that account for this association. Unpredictability is proposed to help explain the relationship between background characteristics and risk-taking. Specifically, this paper explores the importance of environmental SOCIAL