A child firstly learns to differentiate between various things, that is men, women, animals and birds, and later on unifies these differentiated concepts to form a single concept. This is called

Uniting differentiated concepts into a single concept is generalisation.

Restructuration reorganises existing knowledge into a new structure.

Differentiation is only the earlier step of telling categories apart.

Memorisation is committing material to memory by repetition.

Generalisation extends a learned response to similar situations.

It is the counterpart of discrimination in concept formation.