The problem and the solution. The complexity of the domains of human resource development (HRD) requires knowledge of learning theories that can inform the development of HRD theory building, research, and practice. Social learning (cognitive) theory (SLT/SCT) identifies learning as a dynamic interplay between the person, the environment, and behavior. This article explores the elements of SLT/SCT that are most relevant to HRD and identifies theory-building, research, and practice arenas in HRD that have incorporated one or more SLT/SCT propositions. Implications for future HRD theory, research, and practice are proposed. SLT/SCT is shown to have high potential use for HRD due to the comprehensive nature of this theory for explaining learning and behavior.