ry.
===== Key Contributions =====
==== The Four Stages of Cognitive Development ====
Piaget's most wide... qualitatively distinct and sequentially invariant stages. During the **sensorimotor stage** (birth to appr... inations of variables in a logical problem. These stages are not merely developmental timetables but quali
hology at the time — that cognitive developmental stages set hard limits on what can be taught at a given ... ty. These three modes are not strictly sequential stages in the manner of Piaget's cognitive stages: they remain available throughout life, and effective teaching
1789 he was present in Paris to witness the early stages of the French Revolution — an event that impresse... ust be sequential and cumulative, that the higher stages of inquiry presuppose the habits of mind cultivated at the lower stages, and that universal elementary education is not a
of developmental arrest or fixation at particular stages — and, crucially, a phenomenon she termed "viscos... ation of Piaget's stage model by showing that the stages could be selectively disrupted, confirming their
ng spiritual biography.
==== Three Developmental Stages ====
Central to Steiner's educational theory is ... is articulation of three seven-year developmental stages, each with its own dominant faculty, appropriate
