| Development is continuous |
It goes on gradually from conception to death; no sudden jumps |
Vocabulary grows steadily year after year |
| Development is sequential |
Stages follow a fixed, uniform order |
Sitting → crawling → standing → walking; babbling before words |
| General → specific |
Mass, whole-body activity comes before refined, specific responses |
Whole-arm swiping before the pincer grasp; scribbling before letter formation |
| Cephalocaudal |
Proceeds from head to toe |
Infant controls head and neck before trunk and legs |
| Proximodistal |
Proceeds from the centre of the body outward to the extremities |
Shoulder and arm control before wrist and finger control |
| Individual differences |
Each child develops at his or her own rate |
Two normal six-year-olds may read at very different levels |
| Interaction of heredity and environment |
Development is the joint product of both, never of one alone |
Inherited potential is realised only with stimulation and opportunity |
| Predictable pattern, variable rate |
The order is predictable; the speed is not |
All children walk after standing — but at different months |
| Product of maturation and learning |
Readiness must combine with experience |
Training before maturational readiness fails |