Résumé : Within a qualitative methodologic framework aimed to evaluate the construction process of crossborder territories through their governance systems, we analyse here the new European instrument EGCT (European Grouping for Territorial Cooperation). We investigate both its potential as well as its relevance as analytical instrument. Therefore, we present the main elements of this European regulation, and propose an analytical grid for EGTCS, based on the characteristics of the governance systems used by existing EGCTs.