Verslag van de ’Educational Research Workshop on the evaluation of the effectiveness of in-service education for teachers’, Strasbourg 20-23 oktober 1980. Pedagog. Stud. [Internet]. 2023 Aug. 16 [cited 2024 Sep. 21];58(3). Available from: https://testplatform.openjournals.nl/pedagogischestudien/article/view/16027