1988'1, p.88
Gist H.
Mental development of schoolchildren by means available in the process of learning

Proceeding from learning abilities and academic achievements of particular schoolchildren the author tried to establish the nearest zone of their development. (The experiment was performed on V-V1 grade pupils; physical material: theory, exercises, problems, models, etc. was used). It has been established that the introduced procedure of presenting material for learning makes it possible to develop in pupils new ways of comprehending and processing the material, which may be regarded as appearance of a new higher psychological function.