Table I. The FCI sub-test: the degree of progress of JHS students who ere taught with our method.
FCI item (from N3)	No. of classes	No. of students	<g>**
2	11	242	0.68
11	11	242	0.46
13	11	242	0.58
14*	3	61	0.82
average			0.64
* The question was administered only in three of the seven classes that participated in the study
** <g> is the degree of progress1 of the students and indicates the real effectiveness of the approach. <g> = (post-test score − pre-test score)/(100 − pre-test score)

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Table II. Students' achievements in a problem taken from the physics matriculation exam. The ninth-graders studied by the method described herein.
Group	n	answered correctly (%)	explained correctly (%)
Heterogeneous ninth-graders	360	47	41
Advanced physics 12th-graders	1115	42	31

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