Any attempt to assess the possible determinants of the counter-revolutionary changes that have occurred in the kibbutz movement in such institutions as marriage, the family, and sex-role differentiation is beset with formidable difficulties. The problem is too complex, the data are too limited, and our methods of investigation were too primitive to permit an unequivocal interpretation. The weight of the evidence nevertheless suggests that although several possible cultural determinants may have contributed to these changes, on balance they do not appear to have been decisive. Evidence from sabra childhood behavior suggests, instead, that these counterrevolutionary changes were more probably brought about not primarily as a response to external cultural conditions nor by culturally acquired motives, but by precultural motivational dispositions.