Individual Differences in Human Functioning

The Reality of Individual Differences

Variation is not an exception in nature — it is the rule. Every species shows individual variations, and human beings are no different. Think about a world where every object had the same colour. It would be dull and unappealing. In the same way, people are not identical copies of one another. They differ in physical traits like height, weight, strength, and hair colour. More importantly, they differ along psychological dimensions — intelligence, creativity, dominance, sociability, and countless other traits.

Each person is a unique combination of many traits, present in varying degrees. This is what makes every individual distinct. The question that naturally arises is: how and why do people differ? That question is the very subject matter of the study of individual differences.

Defining Individual Differences

For psychologists, individual differences refer to the distinctiveness and variations among people’s characteristics and behaviour patterns. It is the systematic study of how and why individuals differ from one another.

Two Competing Views on What Shapes Behaviour

Psychologists do not all agree on what causes behaviour. Two broad perspectives exist:

The Personal Traits View

Many psychologists believe that our behaviour is influenced primarily by our personal traits — the stable, internal characteristics we carry with us. According to this view, an aggressive person will tend to behave aggressively across different situations.

The Situationist View

Other psychologists hold that behaviour is influenced more by situational factors. This perspective is known as situationism. It states that the situations and circumstances in which a person is placed have a powerful effect on how they behave.