Every year, top-level market regulators, academics and legal practitioners attend the Annual Competition Workshop organised at the European University Institute in Florence. The speakers are invited to discuss a particular set of critical issues in the field of competition law and policy. The entire content of the proceedings - both the oral discussions and the written contributions - are published in the "European Competition Law Annual" series. This is the fourteenth in the series, reproducing the debate which in 2009 examined the evaluation of evidence and its judicial review in competition cases. The issues discussed included, among others, the burden of proof, the standard of proof and the standard of review with respect to antitrust infringement decisions and merger decisions, both at the level of the EU and at the national level in a number of Member States. In 2009, the Workshop participants were: Rafael Allendesalazar; Kelyn Bacon; Judge Gerald Barling; Simon Bishop; Judge Joachim Bornkamm; Judge Michael Boudin; Jochen Burrichter; Dennis Carlton; Fernando Castillo de la Torre; Justin Coombs; Lorenzo Coppi; Claus-Dieter Ehlermann; John Fingleton; Ian Forrester; Judge Nicholas Forwood; Eric Gippini-Fournier; Barry Hawk; Alberto Heimler; Per Hellstrom; Pieter Kalbfleisch; Robert Kwinter; Bruno Lasserre; Philip Lowe; Mel Marquis; Damien Neven; Judge Aindrias O Caoimh; Luis Ortiz Blanco; John Ratliff; J. Thomas Rosch; Heike Schweitzer; Mario Siragusa; Jacques Steenbergen; James Venit; Judge Nils Wahl; and, Judge Vaughn Walker.