This paper develops an understanding of knowledge sharing behavior through the adaptation of two major theories imported from social psychology: Theory of Reasoned Action (TRA) and Theory of Planned Behavior (TpB). Exploring these theories from a knowledge sharing perspective provides an understanding of the different factors facilitating or hindering individual’s knowledge sharing behavior. An extension of these theories has been created to include knowledge sharing constructs into the decision making framework presented by TRA and TpB. At the end, the paper develops theoretical propositions that will set the stage for future research questions...