Résumé : The purpose of the present study is to explore the “misfits” occurring between doctoral students and their supervisors. More precisely, we investigate the types of incongruences that occur, whether and how they are regulated and their consequences on students’ outcomes. Qualitative interviews were conducted with 21 former PhD students (8 completers and 13 non-completers). Results show that, when facing a misfit, PhD students either (1) learn to live with it and/or turn to alternate resources, (2) suffer from it without being able to address the problem with their super-visor, (3) address the issue with their supervisor and try to solve it in various ways, or (4) are unable to address the issue because it reached a point of no return. Further, types of misfit regulation are likely to have an influence on students’ motivation and engagement. These results are discussed in the light of person-environment fit, coping, emotional regu- lation, and conflict management frameworks.