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Our goal was to design and implement professional development (PD) based on a learning trajectory (LT) on geometric measurement of area. The PD was part of an integrated learning system which aligned online performance assessments, a digital game, non-digital classroom activities, and reporting with the LT. Six third grade teachers from the Midwest participated in 20 hours of PD. Data collection included video-recording and collecting teachers’ work throughout the PD sessions. Ongoing and retrospective analyses of the data gave insight into the type of PD components that can credibly support teachers’ use of a LT for formative assessment and instruction, and examined how the results of the PD implementation informed revisions to the other learning system components.