The dramatic increase in the number of competition agencies in the last few years, in the context of a globalized economy, has made international cooperation a core element of competition enforcement. As more and more mergers, cartels, and unilateral restrictive business practises incur a cross-border dimension, cooperation among competition agencies helps achieve effective and coherent enforcement. In this context, it is important that competition authorities adopt proactive and cooperative approaches vis-and#224;-vis their sister agencies in order to tackle these new challenges.