Volume 6, Number 3, 2003. Contents: INTRODUCTION: M.J. Prescott, H.M. Buchanan-Smith, Training Nonhuman Primates Using Positive Reinforcement Techniques. ARTICLES: G.E. Laule, M.A. Bloomsmith, S.J. Schapiro, The Use of Positive Reinforcement Training Techniques to Enhance the Care, Management, and Welfare of Primates in the Laboratory. S.J. Schapiro, M.A. Bloomsmith, G.E. Laule, Positive Reinforcement Training as a Technique to Alter Nonhuman Primate Behavior: Quantitative Assessment of Effectiveness. V. Reinhardt, Working With Rather Than Against Macaques During Blood Collection. L. Scott, P. Pearce, S. Fairhall, N. Muggleton, J. Smith, Training Nonhuman Primates to Cooperate With Scientific Procedures in Applied Biomedical Research. J. McKinley, H.M. Buchanan-Smith, L. Bassett, K. Morris, Training Common Marmosets (Callithrix Jacchus) to Cooperate During Routine Laboratory Procedures: Ease of Training and Time Investment. L. Bassett, H.M. Buchanan-Smith, J. McKinley, T.E. Smith, Effects of Training on Stress-Related Behavior of the Common Marmoset (Callithrix Jacchus) in Relation to Coping With Routine Husbandry Procedures. H. Colahan, C. Breder, J. Ogden, Primate Training at Disney's Animal Kingdom. G. Savastano, A. Hanson, C. McCann, The Development of an Operant Conditioning Program for New World Primates at the Bronx Zoo.