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Shayer, Michael	1

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Accelerating the Development of Formal Thinking in Middle and High School Students IV: Three Years after a Two-Year Intervention.

Peer reviewed

Shayer, Michael; Adey, Philip S. – Journal of Research in Science Teaching, 1993

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,…

Descriptors: Academic Achievement, Developmental Stages, Educational Research, Effect Size