To scale up and sustain the use of evidence-based practices, it is imperative that state education agencies systematically implement professional development that represents best practice. By delivering quality professional development to local districts, it is more likely that transition personnel will implement transition programs and practices with fidelity to sustain implementation over time. To do this, it is important for state education agencies to develop a state-level stakeholder team to determine professional development needs across districts and develop a plan to systematically deliver professional development. This article describes seven steps for using data-based decision-making to develop and implement quality professional development at the local level to ensure districts across a state effectively and sustainably implement secondary transition evidence-based practices.