The goal of the review of studies in 10-12-year-olds is to solve pract
ical problem of optimal conditions of education for them. The data are
controversial, 10-12-year-olds are different from junior schoolchildr
en but at the same time they need gradual environmental changes for no
n-traumatic transition from junior schoolchild's state to adolescence.
The author argues that the principal motive power for such a transiti
on in psychic development is reflection. The reflection serves child's
self-consciousness, child's ability for self-development. It must be
taken into account when the problem of individualisation in learning a
ctivity is considered.