 This paper proposes a four-step approach to developing causal pathway models for implementation strategies. First, the authors suggest specifying implementation strategies accurately and linking them to mechanisms. Next, they propose generating linkages between strategies and mechanisms. Then, they suggest identifying proximal and distal outcomes the strategy is theorized to impact. Lastly, they suggest articulating effect modifiers, such as preconditions and moderators, to understand where, when, and why strategies have an effect on outcomes of interest. This article was authored by Karatzee Lewis, Karatzee Lewis, Karatzee Lewis, and others.