we hold these truths to be self-evident
House Proposal HLA-DRQ7728 for a revised developmental model:
1. Sensory-motor (1-2 yrs): intentional activities, object permanence, imitation

2. Pre-operational John Ashcroft Period (2-7 yrs): egocentrism, rigidity of thought, semi-logical thinking, animism

3. Concrete Operations (7-11 yrs): conservation, reversibility, time, generalized knowledge

4. Formal Operations (11-15 yrs): formulate and test hypotheses, hypothetical thinking

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