This document discusses new teacher retention and the problem of high turnover rates, especially among the top 10% of new teachers. According to studies, the most common reason cited by top teachers for leaving is ineffective feedback and communication from administrators. Two case studies of schools that failed to retain effective new teachers are presented to illustrate the problem. The document then provides suggestions for feedback techniques that could help with retention, such as using goal-oriented reviews, differentiating feedback based on experience, and implementing symmetrical evaluation pathways to allow teacher feedback on administrators. It concludes by posing additional questions around defining effectiveness, identifying top teachers, evaluating administrators, and updating existing evaluation systems.