It is a matter of scientific debate to what extent intelligence is
hereditary. However, in a relatively broad part of the public the
opinion prevails that intelligence is to a large extent hereditary,
which means that it can only be minimally improved through social
intervention. The book presents the scientific methods for determining
heritability in the individual. It is clear from these methods that
there can be no general value for heritability of intelligence, and that
a heritability value says practically nothing as to the extent to which
intelligence can be altered. The volume traces the history of research
on the heritability of intelligence. The discipline is manifestly
plagued by dubious practices and has caused social damage on a large
scale, for example in the context of eugenics, immigration or education
policy.