ABSTRACT
Processes and patterns of behavioral growth and change constitute a central concern in con temporary comparative psychology. Coordi nated analyses have been sought in two do mains, ontogenetic differentiation in individual development, and phylogenetic changes during evolutionary descent. The emergence of new forms in development and in evolution exceeds the scope of explanations according to mecha nistic or reductionist theories. New ways of thinking about growth and change are in the works, to replace traditional static methods based on analysis of variance and group differ ences.
