This paper examines a method for assessing the didactical competence of physical education teachers. The “ critical incident method” (Flanagan, 1954) has been reconsidered to evaluate the skills developed during preservice teacher training. The construct of Didactical Critical Incident is discussed with reference to research in didactics (French paradigm). A cohort of preservice teachers was tested using the investigation method. The results are discussed and interpreted within the theoretical framework of the paradigm. Data collection, data analysis and the main results are presented. The conclusion discusses why the method may be of interest for teacher evaluation in teachers’ education.