Abstract
The article analyses the so-called “major favour clause”, introduced by the 2001 reform of ordinary regionalism, and its impact on the 1972 Statute of Trentino-Alto Adige/Südtirol. To this end, the paper aims to identify several criteria used by the Constitutional Court to apply such a clause and the results of its 20-year application on the legislative competences of the Trentino Alto Adige/Südtirol Region and the two Autonomous Provinces of Trento and Bolzano. The result is a complex picture that has led to uncertainty rather than a solid widening of the special autonomy.