The reality of volunteering in nonprofit organizations who offer services to seniors at home was observed from the viewpoint of two types of actors: volunteers and coordinators. Our results suggest that there are three decisive stages in volunteering: recruitment, realization of volunteer activity, and pursuit of this commitment. For each of them, some factors are more influential than others. Their presence or absence makes possible or not the initiation of this commitment and its pursuit. In this context, a constant negotiation takes place between the actors. Each of them has to adapt himself to others. Nevertheless, this adaptation is limited. So, stability between the position of the organization and that of the volunteer is necessary.