In psychology, development proceeds in a number of ways, including:
Cephalocaudal principle: Development proceeds from head to toe. For example, a child first gains control of their head, then their arms, and then their legs.
Proximodistal principle: Development proceeds from the center of the body outward. For example, the spinal cord develops before the outer parts of the body, and the arms develop before the hands.
Continuity: Growth and development are continuous, and one stage of development lays the foundation for the next.
Integration: Learning happens in parts and is then integrated together as a whole.
Lack of uniformity: Developmental rates and growth of the body and mind occur at different or ununiform rates.
Interrelation: Development in one area can impact the development of another area.
Development is also influenced by both maturation and learning.