Recent research suggests that witnessing events of fission (e.g., the splitting of a solid object) impairs human infants', human adults', and non-human primates' object representations. The present studies investigated the reactions of gorillas and orangutans to cohesion violation across different types of fission events implementing a behavioral…

The purpose of this paper is to provide a formal three-step explication of a question that has been traditionally viewed as fundamental to developmental theory construction and explanation: Is behavioral development continous or discontinuous, or is it both? First, a preliminary structural definition of behavioral development involving a certain…

This study examined the development of aggressive and oppositional behavior among alcoholic and nonalcoholic families using latent growth modeling. The sample consisted of 226 families assessed at 18, 24, 36, and 48 months of child age. Results indicated that children in families with nonalcoholic parents had the lowest levels of aggressive…

This report presents comparative data on standards and regulations for child care programs in Europe, Canada, Israel. Three models of child care systems are identified, and their implementation in eleven countries is described. Model I, the "anglo-American" model implemented in the United Kingdom and Canada, includes two or more parallel…

This report considers the effectiveness of the Follow Through Program as manifested in performance on the Philadelphia city-wide tests, spring 1972. Kindergarten students received the Stanford Early School Achievement Test Level I; First and second grade students received the Metropolitan Achievement Test; Primary II respectively; and third grade…