The special case of the Piagetian model is discussed in relation to test theory. Problems connected with the construction and analysis of a test based on Piaget and Inhelder's The Child's Construction of Quantities are presented, and related to a method of representing the item discrimination which is consonant with Piagetian theory. Loevinger and…

A sex-related difference, favoring boys, was found on initial performance of two samples (one British, one American) of 10- and 11-year-old children on tasks involving volume and density. After classroom instruction that included opportunities for interaction with appropriate materials, both sexes performed at higher levels but differences…

Two years after the end of a two-year intervention program set within the context of science learning intended to promote formal operational thinking, achievement of students (n=234) was tested by their results on British National examinations taken at age 16. Male experimental subjects achieved an average of 40 percent more grades of C or above…

A 1-year lag was found between the effect of an intervention intended to promote formal operational thinking in students initially 11 or 12 years of age and the appearance of substantial science achievement in the experimental groups. A one-year lag on cognitive development and an age/gender interaction were also reported. (Author/KR)

Describes a set of Science Reasoning Tasks which are valid and reliable for assessing the ability of children to use concrete and formal reasoning strategies and can be used by science teachers without professional training in Piagetian studies. Thirty pupils can be tested on each task in about 50 minutes. (Author/DS)

The effect of intervention lessons designed to accelerate the development of formal operations taught over a period of two years to adolescents was assessed. Results indicated that the experimental group had achieved a significantly greater gain in cognitive levels than the control group. Implications are discussed. (CW)

In an attempt to accelerate the development of formal operations in average young adolescents, up to 30 intervention lessons relating to all formal schemata were given by science teachers, over a period of 2 years, to classes in eight British schools. Boys starting the program aged 12 years-plus showed a pre-test, post-test effect size on…

Describes the development of a Piagetian demonstration group test utilized to assess 9-12 year-old students' (N=161) understanding of heat and temperature. Findings include a unitary relationship between Piagetian stages of development and levels of understanding of heat concepts. (DS)

Three years after end of 2-year intervention program intended to promote formal operational thinking, achievement of students initially age 11 was tested by their results on British National examinations, taken at age 16 (experimental group n=88, control group n=103). In comparison with control classes, the effect size for science was 0.67,…