Background: Evaluations are often limited to affirming what impact health and nutrition interventions have, without providing enough insights into “how/why” impacts are achieved. Objectives: This article describes how a Program Impact Pathway (PIP) analysis was used to tailor theory-driven impact and process evaluation of a “Cash-Plus” program combining unconditional cash transfers with behavior change communication (BCC) activities, which was implemented to improve children’s growth in Togo.