निम्नलिखित में से कौन सी पुस्तक विकासात्मक मनोवैज्ञानिक जीन पियाजे द्वारा लिखी गई है?

A child has learned to get his way with a younger sibling by using physical intimidation. If he uses the same tactics on peers, according to Jean Piaget's cognitive development theory, this indicates:

The best characteristic of a socially mature person is:

What is meant by the term 'social maturity' in child psychology?