Concepts of causality in explanations of development, Brian Hopkins and George Butterworth; empirical evidence for causes in development, Peter Bryant; the causes of biological form, Brian Goodwin; causes of development in ethology, Peter Slater; the development of reasoning ability, P.Johnson-Laird; causal explanations of cognitive development, James Russell; on some relations between the description and the explanation of developmental change, Susan Carey; causes of social development from the perspective of an integrated developmental science, Robert Hinde; causes and reasons in social development, Ivana Markova; the child's theory of mind and its cultural context, Paul Harris; life history perspectives on human development, James Chisolm.