The Increase of the Intelligence Quotient through Training

I. Q. throughout their entire school life. So definite has the belief become that the I. Q. is unchangeable that many children are judged mentally on the basis of a Binet test without sufficient time having elapsed to determine whether their I. Q. would remain constant or not. Children whose mental level remains constant, relative to their increasing years, return a constant I. Q. A consideration of the tests included in the Binet series indicates, however, that many of the tests depend upon mental abilities other than those which are