Types of Intelligence Tests

Intelligence tests are not all the same — they differ in how they are given, what kind of material they use, and whether they are fair across different cultural backgrounds. The choice of test depends on the purpose for which it is being used.

Classification by Administration Procedure

On the basis of how a test is administered, intelligence tests are divided into two categories:

• Individual tests — In this type, the test is given to one person at a time. The tester and the test-taker work face-to-face. This allows the tester to observe the person's behaviour closely, note their level of motivation, and clarify instructions if needed. Individual tests are especially useful for young children or people who have difficulty reading or writing.
• Group tests — Here, a single tester can give the test to many people at the same time. Group tests are efficient for large-scale assessment, such as in schools or for recruitment. However, they do not allow the tester to observe each person individually, and they assume that all test-takers can read and follow instructions on their own.

Classification by Nature of Items

Based on the kind of items or tasks used in the test, intelligence tests are classified as:

• Verbal tests — These tests use language. The items involve words, sentences, reading, vocabulary, analogies, and other language-based tasks. The test-taker must be able to read and understand the language in which the test is written. Verbal tests are common but can be unfair to people who are not fluent in that language.
• Performance tests — These tests do not require the use of language. Instead, they involve manipulating objects, completing puzzles, arranging pictures, or solving mazes. Performance tests are useful for testing people who are illiterate, have speech or hearing impairments, or come from a different language background.

Classification by Cultural Fairness

Depending on the extent to which a test favours one culture over another, it can be judged as:

• Culture-fair tests — These tests are designed to minimise the influence of learning and experience specific to any one culture. They try to use items that are equally familiar to people from different cultural backgrounds, such as abstract shapes or simple universal tasks. The goal is to measure innate intellectual ability rather than culturally acquired knowledge.
• Culture-biased tests — These tests contain items that reflect the language, values, knowledge, and experiences of a particular culture. A person from a different culture may perform poorly not because they lack intelligence, but because they are unfamiliar with the content. Most traditional intelligence tests are culture-biased toward the culture in which they were developed. …