Focuses on the experimental designs and methodology of 15 studies, most of which used only part of the methodology for the experimental analysis of behavior. Argues that the failure to fully use available research technology may have contributed to researchers' failure to make experimental contact with the definition of reinforcement. (RH)

An aim of many students of human development is to penetrate behavioral variability in such a way as to reveal stable phenomena. This broad aim is challenged on numerous fronts when researchers study infant behavior, for students of infants are everywhere confronted with variability. But, in the context of research, variability of subjects'…

The New Orleans Parent Child Development Center Intervention Model hypothesizes a series of effects: the Child Development and Family Life Educators impart curricula designed to change mother's attitudes and behavior toward her child in ways which should encourage the development of competence in the child. The two single most important types of…