1984'5, p.41
Kulyutkin Yu. N.
Personality factors in the process of development of cognitive activity in schoolchildren

When a pupil masters his own learning behavior he masters functions and means (motivational, regulatory, etc.) used by his teacher in order to control the process of learning. The pupil therefore directs the recaptured means at himself and appears at the same time as a "I am a pupil" and a "I am a teacher". The most favourable conditions for this are provided by a common activity in a group of classmates which permits to share functional positions between different personalities.