Contribution of Training to Scientists’ Public Engagement Intentions: A Test of Indirect Relationships Using Parallel Multiple Mediation This article investigates the impact science communication training has on engagement intentions through a parallel multiple mediation model. Theory of planned behavior variables for internal efficacy, response efficacy, norms, and attitudes are examined as potential mediators. Based on a survey of randomly selected scientists from universities in the Association of American Universities, results indicate indirect effects for internal efficacy and attitudes toward the audience and consistent direct effects found in earlier research. This research provides a more comprehensive examination of how communication training contributes to scientists’ public engagement activity.