Recent studies indicate that school districts are facing increasing rates of principal turnover. Frequent principal changes deprive schools of the leadership stability they need to succeed, disrupt long-term school reform efforts, and may even be linked to increased teacher turnover and lower levels of student achievement. This Information Capsule summarizes the principal and school characteristics that affect turnover rates; the career choices principals make after they leave the principalship; and the reasons principals most frequently leave their schools. Suggestions for reducing principal turnover are also reviewed. Finally, data on principal experience, turnover, and vacancies in Miami-Dade County Public Schools (M-DCPS) are provided. Analyses conducted by the National Center for Analysis of Longitudinal Data in Education Research found principals with less experience, higher rates of principal turnover, and more principal vacancies in low-income, high-minority, and low-achieving M-DCPS schools. However, the researchers concluded that these findings may not have been influenced as much by students' income level, ethnicity, or achievement level as by other undesirable features of schools that enroll these students, such as a counterproductive school climate and inferior working conditions. (Contains 10 tables.)