Raven's Progressive Metrics are a series of tests that use abstract reasoning in order to test one's intelligence. The matrices were developed by Dr. John Raven in 1936.
The first of three matrices developed by Raven was published in 1938. Called Standard Progressive Matrices, these used five sets with 12 items in blank ink against a white background. Each item in the set gets progressively more difficult, testing one's cognitive ability.
Colored Progressive Matrices are advanced, colored versions of the Standard Progressive Matrices, designed for use by children, the elderly and people with learning disabilities. The third matrix, Advanced Progressive Matrices, boasts 48 items that are separated into a set of 12 and a set of 36. They are designed for adults and adolescents with superior intelligence.