%0 Report %A Bellue, Suzanne %A Bouguen, Adrien %A Gurgand, Marc %A Munier, Valerie %A Tricot, André %T When Effective Teacher Training Falls Short in the Classroom: Evidence from an Experiment in Primary Schools %D 2023 %8 2023 Aug %I Institute of Labor Economics (IZA) %C Bonn %7 IZA Discussion Paper %N 16398 %U https://www.iza.org/publications/dp16398 %X While in-service teacher training programs are designed to enhance the performance of several cohorts of students, there is little evidence on the persistence of their effects. We present the two-year results of a large-scale, randomized study of an intensive in-service teacher training program in France: during and after implementation. Our estimates highlight the short-run effectiveness of the training program; it successfully improves students' outcomes but only during the implementation year. A detailed analysis of teachers' outcomes indicates that teachers changed their pedagogical vision and practices but struggled to apply acquired skills to contents not directly covered in the training. %K professional development %K in-service teacher training %K teacher effect