What does school effectiveness measure?

School effectiveness primarily measures the promotion of student learning outcomes. This concept focuses on how well a school facilitates and enhances students' academic performance and overall development. Effective schools are often characterized by their ability to produce positive results in students, such as higher test scores, increased graduation rates, and improved skills and knowledge acquisition.

The other options, while relevant to various aspects of a school's functioning, do not capture the essence of school effectiveness in an educational context. For instance, student enrollment numbers may indicate the school’s attractiveness but do not directly reflect how well students are learning. The quality of teachers is important, but it is considered a factor contributing to effectiveness rather than a measure in itself. Community involvement, while beneficial for school atmosphere and support, is not a direct measure of how effectively a school promotes learning outcomes. Therefore, the correct answer highlights the core goal of educational institutions to enhance student learning and achievement.