Children require long, uniterrupted periods of play and exploration

This means that no single logic is strong enough to support the total construction of human knowledge.

Reflective abstraction, however, is based not on individual actions but on coordinated actions.

Punishment renders autonomy of conscience impossible.

What is desired is that the teacher ceased being a lecturer, satisfied with transmitting ready-made solutions. His role should rather be that of a mentor stimulating initiative and research.

Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality.

Scientific thought, then, is not momentary; it is not a static instance; it is a process.