Internal evaluators can lead positive, helpful, promotive interactions among colleagues to make evaluation more appropriate, understandable, and accessible. As the motivations and abilities of non-evaluator colleagues are highly varied, interpersonal skills help facilitate cooperation and promote evaluation. Social interdependence theory from social psychology can assist with understanding teamwork and developing interpersonal competence. While the literature links social interdependence theory with evaluation, there is limited understanding of its application in practice. In this article, we share our internal evaluation experiences in three Australian nonprofit organizations to elucidate how we harnessed social connections and interpersonal dynamics to achieve cooperative goals. The purpose of this article is to share our process for using theory and literature to assist with reflecting, planning, and acting, around the way we interact with colleagues. Evaluators may find this process useful when considering how to personalize professional development around interpersonal competencies for evaluation.