This study focuses on the reasons why teachers are leaving charter schools. It is based on analyses of data collected in surveys of charter school employees from around the country from 1997-2006. The authors found that while overall attrition rates fluctuate from year to year and state to state, as many as one in four charter school teachers leave each year- approximately double the traditional public school rate of 11 percent. Moreover, attrition among new teachers in charter schools is close to 40 percent annually. The authors contend that high attrition, "consumes resources of schools, impedes schools' efforts to build professional learning communities and positive, stable school cultures," and recommend that supporters of charters schools focus efforts on reducing teacher attrition.