Differences between secondary schools: A study about school context, group composition, school practice, and school effects with special attention to public and Catholic schools and types of schools

The results indicate that in Flanders secondary schools of different denomination and of different school type (based on their curriculum offerings) differ with respect to several characteristics. With respect to the educational framework, learning environment and learning climate differences between schools are small and differences are more situated within schools. Multilevel analysis reveals that almost 19% of the variance in mathematics achievement is at school level. The effect of denomination is small and disappears when student background (which is related to school practice) is taken into account. The effect of school type remains important when controlled for student background and denomination. Group composition, the social and learning climate, and the opportunity to learn seem to matter and explain almost 90% of the school effect. They also explain more than four fifths of the effect of school type (and denomination together) which accounts for 65% of the school level variance