| Birth to 2 years | Sensory Perception. |
| Motor activity. Few complex mental images. Ego centric. Object permanence. | |
| 2 to 7 years | Pre-operational (2 to 4 Preconceptual, 4 to 7 Intuitive) |
| Own viewpoint only. Unable to image other perspectives. Cannot accept others' views. Animism, transductive reasoning. | |
| 7 to 11 years | Concrete Operations |
| Sees world more objectively. Understands others' views. Language communicates thoughts. Relates conversation. | |
| 11 plus | Formal Operations |
| Hypothesise. Abstract thought. Sees the ideal. Imagination can carry out activities and transfer them to reality. | |
| ERIKSON FOR COMPARISON | |
| 0 - 1 | Trust, relates to one. |
| 1 - 3 | Autonomy, more body control. |
| 3 - 6 | Initiative, imagination, conscience, guilt. |
| 6 - 12 | Industry, produces, works, sees tasks through |
| 12 - 18 | Identity, physical change, concerned with appearance |