The understanding of distance tutoring must be done in relation to the tutor's interventions placed in a systemic framework of the training system. The tutor's attitudes must therefore be considered in relation to the expert designer, the structuring of the course, the host institution, the technological device and the learner. We will place our approach in relation to these different aspects in order to explain the impact of the quality of the tutor on the quality of learning within an entirely distance learning course.