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)

A commentary is made on each of five symposium papers on the unification of cognitive process theory and differential psychology. Future research directions are reviewed within a new theoretical framework as to the process nature of aptitudes and general intelligence. Future psychometric directions and educational implications are discussed. (RD)

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.…

Measurement and psychometric quality of the Sternberg task (S. Sternberg, 1966, 1969), a memory search task, was investigated with 78 undergraduates. Individual performance was fairly homogeneous across responses, fairly unstable over time, and fairly stable across stimulus content. Implications for individual differences research are discussed.…

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…

Longstreth's critique of Jensen's research on the relationship of IQ to individual differences in visual reaction time (RT), measured in the Hick paradigm, is said to have numerous errors of fact and interpretation, some trivial and some of theoretical importance. (Author/LMO)

A critique by Carroll of a study by Jarman and Das (EJ 171 820) is refuted in terms of the methodology and theory of the Jarman and Das study. Additionally, two general issues concerned with individual differences in cognitive processes and strategic behavior are elaborated beyond Carroll's discussion. (Author/CP)

Data used to support Spearman's hypothesis have been incorrectly and inconsistently reported and do not support the claim that African-American-white differences in intelligence are not environmental in origin. Deaf children should not be considered a single population with respect to linguistic deprivation. (SLD)

The theoretical and methodological concepts for research on aptitudes as cognitive processes are discussed. Individual differences constructs are reviewed in relation to cognitive processing models, and studies of short-term memory are reviewed. A coordinated approach to the study of aptitude as information processing is recommended. (Author/RD)