Purpose: This multiyear experimental study was designed to examine (1) the causal impact of McREL International's Balanced Leadership® Professional Development (BLPD) program on school principals' learning, beliefs, and behaviors and (2) whether there were differences in the types of outcomes the professional development influenced. Outcomes included principals' reported sense of efficacy, perceptions of school climate, and leadership behaviors. Research Methods: Approximately 100 school principals in rural Michigan were randomly assigned to either a treatment
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