A pluralistic approach to cognitive differenciation and development Jacques Lautrey Université Paris 5 Institut de Psychologie Laboratoire Cognition et Développement 71 Avenue Edouard Vaillant 92 774 Boulogne-Billancourt Cedex e-mail : Jacques.Lautrey@wanadoo.fr To appear In R. J. Sternberg, J. Lautrey, & T. Lubart (Eds.), Models of Intelligence: International Perspectives. Washington, DC: A.P.A. Press.