title: Experimental differentiation as an innovative form of cooperation in the European Union: Evidence from the Nordic Battlegroup
abstract: This article focuses on the use of experimental differentiation, a form of small-scale pilot program that aims at testing whether further institutional integration can be bolstered in an area where cooperation has not been tested or proven. Experimental differentiation consists of three features. Firstly, participation should not be constrained by membership in the European Union. Secondly, experimental differentiation should consist of short-term projects. Thirdly, the functional scope of such 
journal: Contemporary Security Policy