It is the most common and popular test administered to groups ranging from 5-year-olds to the elderly. It is made of 60 multiple choice questions listed in order of difficulty. This format is designed to measure the test-taker's reasoning ability the eductive ("meaning-making") component of Spearman's g. (g is often referred to as general intelligence.) The tests were originally developed by John C. Raven in 1936. In each test item the subject is asked to identify the missing element that completes a pattern.