Introduction to professional environment The most powerful school-based predictor of student success is an effective teacher.ii Yet numerous studies show that half of teachers are leaving the profession just as they are reaching the point in their career where they are becoming more effective. According to The Irreplaceables: Understanding the Real Retention Crisis in America’s Urban Schools, a report published by TNTP, “When a top teacher leaves [an average school], only 1 in 6 potential replacements will be of similar quality…When a top teacher leaves [a low-performing school] only 1 in 11 potential replacements will be of similar quality.”iv Measuring School Quality: A Perspective from Boston Teachers Research demonstrates that the retention of effective teachers is a critical component of school and student success. 1 2 When effective teachers leave a school, student achievement can suffer, and the schools that suffer most are the ones that are already lagging behind. A key study concluded, “Teacher turnover has a significant and negative effect on student achievement...Moreover, teacher turnover is particularly harmful to students in schools with large populations of low-performing and black students.”v Numerous studies, along with our own teaching experiences, have shown that highly effective teachers are more likely to stay at schools that offer a collaborative environment, opportunities for professional growth and – a factor that can make or break all aspects of a school’s functionality – strong leadership..
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