Accelerating the development of formal thinking in middle and high school students

In an attempt to accelerate the development of formal operations in average young adolescents, intervention lessons relating to all formal schemata were designed in the context of school science courses. Over a period of two years, up to 30 intervention lessons were given by science teachers to their classes in eight schools. Boys who started the program aged 12+ showed a pre‐posttest effect size on Piagetian tests of 0.89 SD compared with...