Stages of Cognitive-Developmental Theory
1. Sensori-motor (Birth-2 yrs): Differentiates self from objects, Recognizes self as agent of action and begins to act intentionally
2. Pre-operational (2-7 years): Learns to use language and to represent objects by images and words
3. Concrete operational (7-11 years): Can think logically about objects and events, Classifies objects according to several features and can order them in series along a single dimension such as size
4. Formal operational (11 years and up): Becomes concerned with the hypothetical, the future, and ideological problems