The authors describe their examination of factors influencing the effectiveness of school leadership teams. They surveyed school leadership teams in 71 elementary and 71 secondary schools in California. Charged with making decisions on school instruction and curriculum, the school leadership teams had received one year of training as a team. Analysis of survey data identified factors that influenced the ability of teams to focus on teaching and learning. The use of data to identify needs and guide decision-making was the greatest predictor of a team’s focus on instructional and curricular issues.