Development includes a series of qualitative and progressive change. Development can be defined as the changes in the structure, thought or behaviour, of a person that occurs as a function of both biological and environmental influences. - The exact course and nature of development is constantly influenced by environmental factors and keeps changing accordingly. - Development is relatively ordered and takes place gradually over a period of time. - Development involves the physical, cognitive, emotional, social, and language development of an individual which are influenced by maturation and learning over the period of time. - It is a continuous process that happens throughout the lifetime, takes place even after attaining maturity of physical growth and not a predetermined factor. - Every individual develops at different rates. - Hereditary growth factors like the colour of the eyes or hair, facial features, etc are determined at the time of birth itself.