This document discusses individual differences and variability. It defines individual differences as variations among individuals in regards to characteristics. There are many types of individual differences, including physical, mental, motor/psychomotor, achievement, emotional, interests, attitudes, aptitudes, values, self-concept, learning styles, and study habits. Individual differences are influenced by heredity and environment. Most individuals fall within the average range, with about 15-16% being above or below average based on a bell curve distribution of traits. A teacher should be sensitive to these differences among students.