ThisideaisbasedonthetheoryofReuvenFeuerstein, a psychologistwhowasworkingwithchildrenarrivingasimmigrantsinIsraelfromNorthAfricancommunitiesinthe 1950s.
Todeterminetheirschoolplacement, thechildrenweresubjectedto a seriesofassessments, including I.Q. tests.
Duringtheassessments, Feuersteinnoticedthatwhilesomechildrenlearned a newtaskveryeasily, othersdidn't.