Examines the relationships between mental maturity and achievement in three types of science concepts-classificational, correlational, and theoretical. (AL)

Two hundred and twenty-five Lebanese elementary school children were interviewed. The ability to conserve number" and liquid" increased with age. Lebanese children lagged behind American middle-class children. (DM)

Perceptual and cognitive development were investigated in two recall tasks with 48 Ss from each of the grades kindergarten, third, and sixth. (Author)

Education involves the learner with his own potential, with the values of ideas, with people and human affairs and these involvements are basic to the individual's growth and effectiveness. (IR)

Research was reviewed to show the changing educational psychology and theories of special education from ancient times to the present, with emphasis on development of theories relating to special education after World War II. (CB)

Task performance experiments concerning properties of mathematical groups with 10 and 11 year-old children are discussed including transfer effects, effects of structural relations, individual differences, and memory (both short and long term). (JG)

The author recommends nonrestrictive questioning as one technique of provoking thought. (Author/JB)

Attempts to determine the age at which the concept of middleness," or intermediately positioned object, emerges and is functional. (MB)

Reports two studies. The first study compared adults and children (aged four, six, and eight) on ability to sort paintings according to artist, a conceptual task that can reveal cognitive organization. The second study compared three groups of eight- to nine-year-olds using slightly different procedures. The results showed strong developmental…