Serious efforts in the direction of a theory of education must re-evaluate the broader significance of play and reappraise its role in human experience. (Authors)

The conservation of distance and of length and the awareness of the horizontal and of the vertical do seem to significantly precede the measurement of length, but the results did not indicate that these four tasks have any developmental order among themselves. Bibliography, charts. (Author)

What is questioned here is not the teaching of words but their premature imposition upon the child before he has acquired the concepts that underlie them. (Author)

Gross comparisons (easiest) were solvable by all; intensive comparisons (medium difficulty) were inversely related to IQ, and extensive comparisons (hardest) were easiest for low IQ, low M.A. and high IQ, high M.A. retardates. (MH)

Disadvantaged preschool children, although less efficient in intellectual performance than advantaged children, were not less likely to inhibit motor responses upon verbal request or less curious. (MH)

Results indicate that (1) babies have better concept of person than object as permanent, but there are important individual differences, (2) rate of person permanence development is related to infant-mother attachment, and (3) rate of person permanence development affects object permanence development. (MH)

Questions concerning the effects of familiar and alien materials, age and culture, and the etiology of conservation are examined in number and continous quantity tasks assessing conservation in Yoruba children from traditional and educationally advantaged homes. (Author/AJ)

A modified anagram task is employed to explore the development of anticipatory imagery and its relationship to reading achievement, complexity of stimulus material, and practice effects. (Author/AJ)

Presents the procedures, results, and conclusions of a study designed to compare the cognitive performance of students from a new curricula (PSSC) and from traditional (non-PSSC) curricula. Results essentially supported contention that PSSC materials were more effective in developing higher cognitive skills. (DS)