The Development of Verbal Communicative Skills in Children / Constance R. Schmidt, Scott G. Paris -- Auditory Feedback and Speech Development / Gerald M. Siegel, Herbert L. Pick Jr., Sharon R. Garber -- Body Size of Infants and Children Around the World in Relation to Socioeconomic Status / Howard V. Meredith -- Human Sexual Dimorphism: Its Cost and Benefit / James L. Mosley, Eileen A. Stan -- Introductory Remarks / Hayne W. Reese -- World Views and Their Influence on Psychological Theory and Research: Kuhn-Lakatos-Laudan / Willis F. Overton -- The History of the Psychology of Learning as a Rational Process: Lakatos Versus Kuhn / Peter Barker, Barry Gholson -- Functionalist and Structuralist Research Programs in Developmental Psychology: Incommensurability or Synthesis? / Harry Beilin -- In Defense of Kuhn: A Discussion of His Detractors / David S. Palermo -- Comments on Beilin's Epistemology and Palermo's Defense of Kuhn / Willis F. Overton -- From Kuhn to Lakatos to Laudan / Peter Barker, Barry Gholson -- Overton's and Palermo's Relativism: One Step Forward, Two Steps Back / Harry Beilin.