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This work-in-progress paper describes the development of an assessment for teachers’ pedagogical content knowledge (PCK) for data fluency – the ability and confidence to actively make sense of and use data. In the context of a project that seeks to develop and pilot test data fluency professional learning for mathematics and science teachers in grades 6–9, researchers constructed a novel instrument for assessing teachers’ specialized knowledge for teaching, which lives at the intersection of data knowledge, domain-specific knowledge, pedagogy, and technology. This online one-hour instrument is a written performance task and is sensitive to three dimensions of PCK: 1) teachers’ ability to analyze student thinking, 2) teachers’ ability to plan instruction, and 3) the degree to which teachers’ responses reflect a learner-centered orientation. The project team is currently developing a scoring rubric for this instrument, which will be revised based on the pretest and posttest data from the pilot study.