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This article deals with commitment issues in the workplace. It undertakes a literature review on the concepts of “commitment” and “engagement” in Work and Organizational Psychology. Then, based on empirical and clinical data from a clinical intervention in the activity of 13 supervisors of a public sweeping and waste collection department, we suggest that commitment and disengagement at work are processes connected to professional activity. Based on a simple and cross self-confrontation analysis of daily work activities, we show that these processes are linked to work activity and may vary according to the context and resources (individual, collective, or organizational) in which professionals carry out their work. The linguistic analysis of dialogues resulting from this intervention makes it possible to describe concrete dynamics of engagement and disengagement and their ambivalent consequences. We conclude that commitment at work does not necessarily mean occupational health.