Behind any training objective, a multi-faceted reality can be found. Whether they are in charge of conceiving the course, animating it, or following it, all the actors involved act upon the training course and invest in it dispositions, convictions, interrogations and both professional and personal situations. In context and in the course of time, from the moment of the course creation until its effects upon the employees of a large IT company a few months or years after they have taken it, the article thus analyses the various ways these employees appropriate the teachings of a "personal development" course. It then studies the gap that may exist between expected and actually observed effects, whether it be at an individual, collective or social level.