Intelligentiemetingen

One way psychologists measure intelligence is by using standardized tests that produce a score known as the intelligence quotient or IQ.

The key principles behind the construction of intelligence tests are — validity, reliability, and standardization.

The validity of the test scores ensures that they accurately measure intelligence rather than other traits, such as anxiety or creativity. For instance, an intelligence test's validity might be evaluated by correlating scores with students' academic performance evaluations.

Likewise, one form of reliability refers to the consistency of test results over time. A reliable IQ test will produce similar scores if taken multiple times under the same conditions.

Additionally, standardization of tests involves uniform procedures for administering and scoring the test. For example, all test-takers should experience similar testing environments to ensure fairness.

Norms are established by testing a large, representative group to create benchmarks. For example, a test normed on various age groups of students provides a basis to compare a student's score against their peers.

Early intelligence testing by Alfred Binet established the foundation for modern IQ tests.