An aptitude test is designed to predict a person’s future performance in a particular domain. It measures the capacity to learn or acquire skill rather than the knowledge already gained.

College entrance examinations, military classification batteries, and employment tests for specialized jobs are common examples. A well-constructed aptitude test samples the cognitive or perceptual abilities that training will later build upon—spatial reasoning for architecture, numerical facility for accounting, mechanical comprehension for technical trades. Predictive validity is the key technical requirement: scores should correlate with later success in the relevant training or occupation.

Aptitude tests are often contrasted with achievement tests, though the boundary is not absolute. Prior experience inevitably influences performance on any cognitive measure. Critics argue that many so-called aptitude tests are contaminated by cultural knowledge and educational opportunity; defenders reply that, used carefully, they still improve the fairness and efficiency of selection decisions compared with unstructured judgment.

An aptitude score is a forecast, not a destiny. Motivation, instruction, and opportunity still determine how far the predicted capacity is realized.