Setting the scene : European debates on collective redress in competition law -- Rule 23 FRCP : "aggregating" individual antitrust claimants in "diffuse injury" cases, the certification criteria of "commonality", predominance and superiority and the obligation to serve notice -- "Managing" antitrust class actions under Rule 23(b)(3) FRCP : who "plays the pipe"? And who pays the piper? -- The EU Commission agenda on collective redress : from a "sector specific" to a mainstream discussion of "group justice" questions -- Collective litigation in competition cases in the United Kingdom : between "personal autonomy" in civil litigation and effective judicial protection -- Collective litigation and collective redress in competition claims : continental solutions, the cases of Italy and the Netherlands -- Access to justice, diffuse torts and competition litigation in the EU : where do we go from here?