Raven's Advanced Progressive Matrices is a non-verbal reasoning test that is used to measure one's ability to use reasoning and logical ability. The Raven tests use images placed in a 2x2, 3x3 or 4x4 matrix that follow a logical order or pattern. The goal of the test-taker is to discover the pattern. Since the Raven tests do not rely on any language abilities or previous knowledge, the tests are believed to be a reliable indicator of a person's general intelligence, or IQ. Converting a Raven score to an IQ score is possible using a few short steps.