Econometric Theory is proud to announce the winning article for The Tjalling C. Koopmans Econometric Theory Prize for the period 2000–2002 inclusive. The winning article and citation (written by the Advisory Board) are as follows: Stefan Sperlich, Dag Tjøstheim, and Lijian Yang are awarded the Tjalling C. Koopmans Econometric Theory Prize for their paper Nonparametric Estimation and Testing of Interaction in Additive Models, which appeared in Econometric Theory 18(2), April 2002, pages 197–251

Econometric Theory acknowledges the services of the following persons who acted as referees for the Journal during 2002. The quality of the final research product that appears in each issue of the Journal owes much to the specialist knowledge and painstaking, silent contributions of our referees. The Editor, Co-Editors, and Cambridge University Press thank all our referees for their services and apologize if the following list is in any way incomplete.