“…In particular, we investigate the role of teachers' knowledge of the subject they teach, using unique cross-sectional data collected from nationally representative surveys of schools in Kenya, Nigeria, Mozambique, Senegal, Tanzania, Togo, and Uganda (these countries, together, represent close to 40 percent of the region's total population). The data quantify teacher quality along three core quality dimensions: time spent teaching, teachers' knowledge of the subject they are teaching, and teachers' pedagogical skills (see Bold et al 2017). Unlike many other large-scale data collection efforts, which assess students and teachers using multiple choice items and thus introduce additional chance variation in test scores, the data we use are collected using one-on-one tests for students, and test scores for teachers that are derived from mock student tests marked by the teachers.…”