1.   Action is one of several interacting determinants of cognitive development.

2.   Adolescent Egocentrism Egocentrism is a constant companion of cognitive development.

3.   Affective development is not independent of cognitive development.

4.   As cognitive development reaches an upper limit with full attainment of formal operations, so too does affective development.

5.   At each new level of cognitive development, previous levels are incorporated and integrated.

6.   Cognitive development, though a continuous process, can be divided into four stages for purposes of analysis and description.

7.   Indeed, Piaget asserted that the basic principles of cognitive development are the same as those of biological development.

8.   Mental and physical actions in the environment are a necessary but not sufficient condition for cognitive development.

9.   Piaget identified social interaction as one of the major variables that facilitate cognitive development.

10.   Social Interaction Another factor in cognitive development is social interaction.