New studies show that the instructional effectiveness of preservice candidates and their cooperating teachers are positively related. However, we neither know if these relationships are causal nor, assuming they are, if it is possible to significantly increase the instructional effectiveness of the cooperating teacher pool. In this study, we randomly assign districts to receive recommendation lists (generated using administrative data) for the recruitment of more promising cooperating teachers. Districts receiving lists recruited significantly more effective/experienced cooperating teachers, while candidates placed in these districts felt significantly better prepared to teach. As a result, this study offers an innovative, low-cost strategy for recruiting effective/experienced cooperating teachers and presents the first causal estimates that more effective/experienced cooperating teachers improve candidates’ preparedness to teach.

最新研究表明，职前应聘者及其合作教师的教学效果是正相关的。但是，我们既不知道这些关系是否是因果关系，也不知道它们是否是因果关系，是否可以显着提高合作教师池的教学效果。在本研究中，我们随机分配地区以接收推荐列表（使用行政数据生成），以征聘更有前途的合作教师。接受名单的地区招募了更有效/有经验的合作教师，而被安置在这些地区的候选人则感觉准备好了很多。因此，这项研究提供了一种创新，