“…Apart from this broad consensus statement, the nature and scope of activities and developmental participation that lead to extraordinary success in sports have been controversially discussed in international literature for many years (Côté, Baker, & Abernethy, 2007;Güllich, 2017;Sieghartsleitner, Zuber, Zibung, & Conzelmann, 2018). Given the increasing number of international competitions with growing governmental involvement (Heinilä, 1982;Houlihan & Green, 2008) and the belief that senior sports success is producible (De Bosscher & De Rycke, 2017;De Bosscher, Shibli, Westerbeek, & Van Bottenburg, 2015), there is a clear need for more detailed research on the career of athletes achieving international success from different theoretical perspectives (Barth, Emrich, & Daumann, 2018;Barth, Güllich, & Emrich, 2018;Güllich & Emrich, 2014). This article contributes to the existing body of literature in two respects: first, by reviewing the existing literature on developmental activities-that is, the volume of domainspecific structured practice (institutionalized practice in organized settings such as sports clubs, extracurricular highschool sports, or sport academies in the main sport of the athlete; hereinafter: main-sport practice) as well as outside domain-specific structured practice (institutionalized practice in other sports; hereinafter: other-sports practice) and, additionally, the age at the beginning of main-sport practice-of athletes achieving at least once international success (hereinafter: international-level athletes) and (internationally) less successful senior athletes (hereinafter: nationallevel athletes), laying special focus on the statistical methods applied in the empirical studies.…”