There is increasing consensus among psycho-educational scholars about argumentation as a means to improve student knowledge and understanding of subject matter. In this article, we argue that, notwithstanding a strong theoretical rationale, causal evidence is not abundant, definitions of the objects of study (argumentation, learning) are often not…

Results on human performance on the Traveling Salesman Problem (TSP) from different laboratories show high consistency. However, one exception is in the area of individual differences. While one research group has consistently failed to find systematic individual differences across instances of TSPs (Chronicle, MacGregor and Ormerod), another…

The author replies to Jensen and Vernon's article and maintains that there is little reason for accepting Jensen's claims, particularly with respect to the major theoretical question. (Author/LMO)

Describes the use of repeated-measures designs in the study of whole families, specifically differences in perception between family members. Addresses the specific advantages and disadvantages of these designs; analysis of variance and multivariate analysis of variance applications; and practical issues of assumptions, multiple comparison,…

Lev Vygotsky maintained that historical and cultural aspects of development started from the point at which humans could first be distinguished from apes. It is critical to consider the dialectical relationship between the individual and the cultural environment in which the child actively masters cultural behavior. Interaction with others…

Describes seven myths concerning reading-level-match designs, in which individual differences in reading acquisition are compared for groups of different ages matched on some aspect of reading performance. Gives examples from the reading literature to illustrate these myths and to suggest more realistic alternatives. Summarizes relevant…

Reviews some findings obtained through comparisons of dyslexic readers with nondyslexic readers matched by chronological or reading age. Notes some of the problems and pitfalls associated with this approach. Explores the potential of other group comparisons when examining sources of reading difficulty, and discusses individual differences within…

Several different methodological approaches that have been used in studying language in children with autism are outlined. In classic studies, children with autism are compared to comparison groups typically matched on age, IQ, or mental age in order to identify which aspects of language are uniquely impaired in autism. Several methodological…

Summarizes data on developmental patterns in constructive play--play in which children use play materials to make something. Reviews knowledge about developmental correlates and effects of constructive play behavior and examines methodological and theoretical issues. (NH)

Four points are made in regard to the controversial reaction times studies: (1) apparatus used is not the best; (2) practice effects have not been thoroughly accounted for; (3) there is some evidence that simple reactions are different from choice ones; and (4) basic data to be explained are those which show substantial group differences.…

Discusses methodological problems in the use of ecological analysis and pancultural analysis in cross-cultural analysis. Uses a case study to compare the use of cross-cultural analysis and a new procedure based on a within-culture standardization procedure. (FMW)

Two articles discuss the controversy about the relationship between reliability and the power of significance tests in response to the discussion of Donald W. Zimmerman, Richard H. Williams, and Bruno D. Zumbo. Lloyd G. Humphreys emphasizes the differences between what statisticians can do and constraints on researchers. Zimmerman, Williams, and…

Introduces the "person approach" to the study of adolescence, and discusses the consequences of the approach for theoretical thinking and research methodology. Reviews major types of pattern-based methods used for carrying out a person approach and discusses methodological challenges for adolescent research, including interindividual…

The concept of "multi-dimensionality" which attempts to explain differences between social classes in Lipset's formulation, has suffered from confusion regarding the level of analysis (individual or social class). In this study of college students, the multi-dimensional concept of political liberalism-conservatism was found to be unwarranted on…

Recent studies are examined for methodological adequacy in establishing dimensions of individual differences in information-processing abilities, and the theoretical problems involved in inferring psychological processes from individual difference dimensions. Methodological inadequacies include use of small samples, questionable procedures in…