Principals are the second-largest school-based contributor to student achievement. Interventions focused early in the “pipeline” for identifying and developing effective principals might be a promising strategy for promoting principal effectiveness, yet no prior research has examined measures of principal performance during preservice preparation. We analyze 31 measures of principal practices developed by New Leaders and integrate into their year-long, preservice Aspiring Principals program. We link these measures to administrative data in nine districts to understand how they predict student and principal outcomes after candidate placement. We find associations with gains in student achievement on standardized tests, gains in student attendance, and higher rates of principal retention. We compare our results with studies of measures from licensure exams and evaluation systems.

校长是学生成绩的第二大校本贡献者。在“管道”早期进行干预以识别和发展有效的委托人可能是提高委托人有效性的有前途的策略，但之前的研究没有检查过在职前准备期间委托人绩效的衡量标准。我们分析了新领导者制定的 31 项主要实践措施，并将其整合到他们为期一年的职前有志校长计划中。我们将这些措施与九个地区的行政数据联系起来，以了解它们如何预测候选人安置后的学生和主要成果。我们发现学生在标准化考试中的成绩提高、学生出勤率提高以及校长保留率提高之间存在关联。