A summary covering 179 titles appearing in 1930. Critical studies of tests and test technique continue apace. The values of intelligence tests are being scrutinized with special reference to re-test reliability and to correlations with other types of tests, school factors, other environmental factors, personality traits, etc. Individual differences tested bear upon differences of age, sex, school grade, and inheritance, and special types are studied, e.g., superiors, defectives, delinquents, deaf, and blind.