Investigates the asserted differences in reasoning between adults and second, fourth, and sixth graders in a manipulation of variables task using class inclusion and story problems with common everyday situations. Results are discussed in terms of sensible reasoning and problem-solving skills. (CM)

A study investigated the relationship between formal and conversational logic. Thirty-two male and 32 female college students evaluated the conclusions of conditional syllogism and participated in an interview adapted from Deanna Kuhn's (1991) monograph, "The Skills of Argument." Students were asked to provide explanations for several…

Six experiments examined the problem-solving behavior of normal and mentally retarded (MR) children with a two-choice discrimination learning situation: the effects of stimulus similarity upon types of solutions utilized by MR children; the role of redundant cues in the discrimination learning of MR subjects with differing mental ages; the…