This article maps out the channels at the disposal of private parties for challenging the legality of EC measures, and attempts some predictions of the future shape and content of this plank of the EU’s judicial architecture. This area of the law is in a state of flux, particularly in the light of rulings such asUEAPMEv.Council, Masterfoods Limitedv.HB Ice Cream, Fresh Marine Company ASv.Commission, Laboratoires Pharmaceutiques Bergaderm SA, in liquidation, andJean-Jacques Goupilv.Commission, Bocchi Food Trade International GmbHv.Commission, and most recently, and significantly,Jégo Quéré and Cie SAv.Commission. In this latter ruling the Court of First Instance prescribed a major change to the rules onlocus standiunder Article 230(4) of the EC Treaty, a hitherto much maligned aspect of the case law, by relaxing the requirement of ‘individual concern’ laid down in that article.