The Goldstein-Scheerer Tests of Abstract and Concrete Thinking are reviewed. This evaluative summary supplements several reviews in the Mental Measurements Yearbook series. The Goldstein-Scheerer tests are used by clinicians and researchers to distinguish normal individuals (those able to engage in two qualitatively different levels of cognitive behavior--concrete and abstract) from abnormal individuals (organically impaired as well as psychiatric sub-groups, capable of concrete behavior only). The concrete and abstract attitudes are not acquired or learned but are capacity levels of the entire personality. The eight characteristics of the abstract attitude are listed, as well as descriptions of the five sub-tests making up the individual performance test battery: (1) Goldstein-Scheerer Cube Test; (2) Gelb-Goldstein Color Sorting Test; (3) Gelb-Goldstein-Weigl-Scheerer Object Sorting Test; (4) Weigl-Goldstein-Scheerer Color Form Sorting Test; and (5) Goldstein-Scheerer Stick Test. Intended practical applications, intended clientele, and the fact that the test manual includes no standard scoring system are briefly discussed. A number of validity studies, published from 1945 to the present, are reviewed. Cost of the test is also mentioned. (MAC)