(i) Development is a process by which an individual grows and changes throughout the life cycle. It is the pattern of progressive, orderly, and predictable changes that begin at conception and continue throughout life. Development applies to changes that have direction and hold definite relationship with what precedes and what follows. It involves changes in physical aspects, thinking, language, and social relationships in an integrated manner, including both growth and decline.

(ii) Growth refers to an increase in the size of body parts or of the organism as a whole. It can be measured or quantified, such as growth in height or weight. Growth is only one aspect of development and is limited to quantitative physical changes.

Maturation refers to changes that follow an orderly sequence and are largely dictated by the genetic blueprint. It produces commonalities in our growth and development. For example, most children can sit without support by 7 months and walk by one year. These processes "unfold from within" following an inner, genetically determined timetable.

The key differences are: Growth is quantitative and measurable, focusing on physical size. Maturation is genetically determined and follows a predictable sequence. Development is the broadest concept, encompassing growth, maturation, and all progressive changes throughout life, including both growth and decline.