Systematic studies on effectiveness of in-service teacher professional development (PD) are important for science education research and practice. Previous studies mostly focus on one certain aspect of the entire program, for example, effectiveness of PD on improvement of teachers' knowledge or students' learning outcomes. This study, however,…

This study investigates inter-school variations in several dimensions of opportunity to learn as well as examines the extent to which these measures significantly affect students' performance on grade 7 literacy and numeracy exams. After situating the study within the global discourse emphasizing the importance of providing access to quality…