The complexity of social and health problems now means that it is no longer possible for a single professional to respond to the multiple needs of patients while taking into account both their physical, psychological and social well-being. The practice of interbranch collaboration would be an avenue to be favoured. The training of pre-graduated students is identified as a promising lever to encourage the use of this practice. To date, however, few studies have explored the effectiveness of such training. This research has two objectives: (1) assess whether the interprofessional training programme for person-centred collaborative practice, offered in five family medicine units in Quebec, makes the attitudes of medical, social service and nursing students more positive towards collaborative work and (2) identify factors that have facilitated or limited the change in students’ attitudes. The approach was based on the patient-centred inter-professional training framework developed by D’Amour and Oandasan (2004). A questionnaire on attitudes was given to students before training and immediately afterwards to measure their evolution. Then, six individual interviews and three group discussions were conducted with students from the three different disciplines in order to better understand the environment in which the training was offered to them. According to quantitative results, the training did not change students’ attitudes towards collaborative work. Qualitative results provide a complementary view, highlighting many of the benefits associated with training, both in terms of attitudes and knowledge acquisition. The factors identified as having facilitated or limited the effectiveness of training make it possible to draw up recommendations for the development of possible training programmes.