This article identifies four factors for consideration in norms‐based research to enhance the predictive ability of theoretical models. First, it makes the distinction between perceived and collective norms and between descriptive and injunctive norms. Second, the article addresses the role of important moderators in the relationship between descriptive norms and behaviors, including outcome expectations, group identity, and ego involvement. Third, it discusses the role of both interpersonal and mass communication in normative influences. Lastly, it outlines behavioral attributes that determine susceptibility to normative influences, including behavioral ambiguity and the public or private nature of the behavior.

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We revisit some ideas from our previous article on social norms by conceptualizing norms as dynamic entities that both affect and are affected by human action; elaborating on the distinction between collective and perceived norms; summarizing key findings from studies that have adopted the theory of normative social behavior (TNSB) and thereby proposing guidelines for further expanding the purview of the TNSB; discussing the attribute-centered approach as a framework for focusing on behavioral characteristics; and highlighting areas for further inquiry into social norms.

The Extended Parallel Process Model (EPPM; Communication Monographs, 59, 1992, 329) is a predominant message design theory in the social science fear appeal literature that provides a framework for effective communication of health‐related information. This paper provides a review and update of the theory and the use of fear appeals in persuasion. First, a brief overview of the EPPM is provided. Then, Littlejohn and Foss (Theories of Human Communication, 2005, Belmont, CA: Thomson Wadsworth) criteria for evaluation of theory are used as a guide for reviewing research guided by the EPPM in terms of the consistency of data with theoretical predictions, how it has been adjusted and extended through research findings, and a discussion of future research to expand social scientific knowledge about fear appeals and persuasion. It is concluded that the EPPM has advanced our understanding of how fear appeals operate and continues to generate questions for research in risk messaging.