I. Introduction. Allergies and Affinities: Social Psychology Pathways as Ways of Seeing Inside Addiction, N. Campbell. II. Basic Processes. Delay Discounting and Addictive Behavior: Review of the Literature and Identification of Emerging Priorities, M. Amlung, J.C. Gray, J. MacKillop. Motivation and Self-regulation in Addiction, C.E. Kopetz. Social Exclusion and Risky Health Decisions: Substance Use Cognitions and Behaviors, M.L. Stock, F.X. Gibbons, J.B. Beekman. Alcohol and Emotion: The Importance of Social Context, M.A. Sayette, C.E. Fairbairn, K.G. Creswell. The Role of Expectancy in Substance-Abuse Progression, H. Treloar, S.L. Pedersen, D.M. McCarthy. Social Identity and Substance Use: The Role of Racial Ethnic Identity and Gender-relevant Factors that Contribute to Substance Use Among Diverse Populations, A. Kaya, D.K. Iwamoto, L. Clinton, M. Grivel. Social Influence, Pressure, and Norms: Vulnerability for Substance Use in Adolescents, C. Neighbors, C.M. Young, H. Krieger, J.L. Tackett. III. Application Challenges. How Basic Science Can Inform Prevention, Treatment, and Policy. Cognitive Motivational Processes Underlying Addiction Treatment, R.W. Wiers, D. Becker, R. Holland, F. Moggi, C.W. Lejuez. Self-affirmation Intervention and the Reduction of Addictive Behaviors, O. Fotuhi, G.L. Cohen.Public Communication for Drug Abuse Prevention: A Synthesis of Current Meta-Analytic Evidence of Message Efficacy, C.R. Jones, D.Albarracin.