Abstract
This analysis investigates a survey scale for principal leadership of middle school mathematics instruction. It assesses scale validity by comparing results from an item response theory analysis with a hypothesized two-level structure for the construct developed from prior research. Contrary to expectation, results show that patterns of math-specific leadership are similar to patterns of principal leadership more generally across subject areas. However, differences appear in the task of setting instructional vision. The task of setting vision for mathematics appears to be relatively more difficult, compared with other tasks, than the task of setting schoolwide vision. Additional items may be needed to optimally measure all levels of principal leadership for mathematics, and the higher level of the construct may require reconceptualization.
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