Flandern: Only 21.4 % of lower secondary school principals reported that they often or very often observe instruction in the classroom …

Flandern: „Only 21.4 % of lower secondary school principals reported that they often or very often observe instruction in the classroom, compared to an international average of 49 %.“
OECD (Hrsg.), OECD Reviews of School Resources: Flemish Community of Belgium 2015 (2015), S. 157.