This article presents an iterative examination of a grounded theory of collaboration in conjunction with social psychology literature. The resulting PILAR (Prospects, Involved, Liked, Agency, Respect) model of collaboration encapsulates over 30 social and group psychology (SGP) theories, including social identity theory, social network analysis, and psychological safety. Selected works of the early 20th-century scholars Lewin, Moreno, Simmel, and Foucault resonate with the PILAR model. We considered that, in constructing a generalized model of collaboration made possible by the availability of modern SGP theory, PILAR may represent advancement toward accomplishing these early scholars’ original intent. To validate PILAR, we proposed an empirical investigation for its consistency with organizational psychology, positive psychology, and appreciative inquiry, and for testing whether learning PILAR may improve collaboration skills for individuals lacking empathy.