Strategic planning (SP) remains the dominant approach to strategy formulation at all levels of government, and it is an enduring topic of public administration research and practice. Simultaneously, little is known about the conditions under which strategic plans are successfully implemented in government. This Viewpoint essay provides evidence-based recommendations from SP initiatives in Flemish municipalities using multi-informant and multisource survey data. It shows that successfully implementing strategic plans is influenced by the people, process, and plan (3Ps) underlying SP. Involving creators in SP helps make the SP process more informed. An informed SP process that includes constructive conflict helps induce high-quality strategic plans. High-quality strategic plans contribute to successful strategic plan implementation. Practitioners are encouraged to consider SP not as a one-size-fits-all solution to strategy formulation, but as an approach in which variation in people, process, and plan influences implementation success.