Finding supports the educational theory and practices of Montessori educators. (Authors)

Mediational Deficiency is used here as a generic term to apply to a failure to mediate due to either a production deficiency (external event) or a control deficiency (potential mediator). (MB)

It was suggested that working-class mothers less frequently believed that their infants were capable of communicating with other people, and hence felt it was futile to attempt to interact with them verbally. (Authors)

Studies conducted among the Kpelle of north central Liberia whose present cultural milieu offers unique possibilities for studying the role of particular experiential factors, particularly education, on the development of paradigmatic response. (Authors)

Wariness did not set in gradually over a period of time but, on the contrary, was found in its fully developed form at 9 months, having been completely absent at 8 months. (Authors/MB)

A much greater positive effect of the program was found with culturally deprived, preschool Negro children than with more advantaged Caucasian children. (Authors)

Implications of this study on child-development theory, education, and psychotherapy are discussed. (MB)

Implication of findings for designing an introductory mathematics curriculum are discussed. (Authors)

Purpose of the study was to evaluate the effectiveness of a hierarchically arranged instructional program in multiple classification, which refers to the ability to define a class by two or more attributes simultaneously. (Authors/MB)

Data suggest that the effectiveness of verbalization in concept identification depends on the aspect of the task which is verbalized. (Author)

To what extent and in what specific ways ethnic background, particularly blingualism, relate to linguistic development is a matter of concern with respect to curriculum development and instruction. (Authors/MB)

Major results indicated that (a) mothers who had not attended college were markedly more prohibitive and intrusive than college-educated mothers; (b) mothers were more intrusive with sons than with daughters; and (c) the children were generally obedient. (Authors)