(viii) There are wide individual differences in growth:
Individual differences in growth are caused by differences in heredity and environment. (ix) Growth is both quantitative and qualitative: These two aspects are inseparable. The child not only grows in size he grows up or matures in structure and function too. (x) Development is predictable: It is possible for us to predict at an early age the range within which the mature development of the child is likely to fall. However, mental development cannot be predicted with the same degree of accuracy.