Three studies examined preschool children's understanding of categorical hierarchies, testing their ability to form categories at different levels of generality and to include the same objects in multiple categories. Found that, contrary to the implications of previous studies, two- and three-year olds appear to have both categorization skills.…

Argues that the development of object perception in infancy involves the detection of structural invariants and that such detection is best understood in the context of dynamic events. (Author/MP)

The use of category organization in free recall was studied in elementary school students. Trained subjects showed higher recall. Several indices of organization were compared and evaluated. (ST)

Degree of organization in presenting stimuli, and training through modeling versus guided practice, were studied on a dial-reading concept using 144 third or fifth graders. (ST)

Second, fifth, and eighth graders viewed one of four edited versions of a commercial action-adventure television program that varied in number of scenes and in degree of organization. Both recognition and recall measures were used to assess children's memory for central content, peripheral content, and implicit content. (Author/JMB)

Article is concerned principally with the early acquisition of skills relating to the manipulation of things, though perforce the role of certain social skills is treated in the interest of explicating that topic. (Author/CB)

Reports three experiments which tested the hypotheses that: (1) as they mature, students become better able to identify the essential organizing features and crucial elements of text, and (2) that this ability is an essential prerequisite for effective use of a limited processing capacity and restricted time when studying. (JMB)

Significant correlations were obtained between the language comprehension scores of the children and both the quality of the task directed to them and the way in which the nursery was organized. (Authors)