Psychologists devise free test for measuring intelligence

Raven’s Advanced Progressive Matrices is a widely used standardized test to measure reasoning ability. One drawback, however, is that the test takes 40 to 60 minutes to complete. Another is that the test kit and answer sheets can cost hundreds of dollars. Psychologists have now developed a highly comparable free test that takes 10 minutes to complete. The user-friendly test measures abstract problem-solving ability and works on tablets and other mobile devices.