How do we know teacher professional development is working?: Measuring changes in teaching practices in the classroom

This note provides guidance on how to establish a numerical indicator to measure teaching practices through classroom observation tools, and how to benchmark this indicator to track changes in teaching practices over time for use in educational interventions. This guidance is structured through a three-step process: step 1, selecting an appropriate classroom observation tool; step 2, selecting an indicator to track teaching practices using that tool; and step 3, establishing a reasonable benchmarking target for the chosen indicator.