We describe a targeted professional development (PD) intervention designed to improve the quality of individualized family service plans (IFSPs) and to support IFSP planning, development, and decision making. The theoretical and empirical foundations for the PD intervention and its key components are reviewed. Building on an established online IFSP data collection system, we describe how the system was enhanced as part of the PD intervention. We discuss the iterative processes used to develop and validate the intervention and present preliminary findings from a pilot study focused on examining the feasibility and acceptability of implementing the intervention in an authentic Part C setting.