The objectives of this study were (1) to explore the Transition Monitoring Survey (TMS) for assessing athletes’ transition from junior to senior sports, (2) to describe the transition from junior to senior sports in Swedish athletes based on the TMS data, and (3) to explore how the transition variables contribute to the athletes’ perceived degree of adjustment to the senior level and to their sport and life satisfaction. The TMS was developed based on career development/transition frameworks (Stambulova, 1994, 2003; Wylleman & Lavallee, 2004) and previous qualitative research on the transition from junior to senior sports. Altogether 416 participants organized in three samples were involved in this exploratory study. The study illuminated the strong points of the TMS as a theoretically based and culturally adapted instrument, but it also shed a light on some deficits of the TMS that should be eliminated in its further use in transition research. © 2012 Copyright International Society of Sport Psychology.