Piaget's 4 main stages of cognitive development:
age 0 - 2 Sensori - motor
knowledge acquired through actions, egocentric, lack of object permanence (realizing that something is still there even when it cannot be seen)
age 2 - 7 Pre - operational
knowledge acquired through perception, egocentric ( find it difficult to take on board views other than their own), lack of conservation ( cannot comprehend that quantity is not changed merely by transforming how it looks, e.g pouring water from a tall thin glass into a short wide one; because of the height change of the liquids, pre - operational children would believe the volume was less) . Pre - operational children can group and classify objects, but only according to one feature e.g colour or shape but not both at the same time.
age 7 - 11 Concrete operational
adult logic in concrete situations, can logically think about objects and events, ability to conserve mass (7), weight (9) and number(6), now able to classify according to several features and order in series.
age 11+ formal operational
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