The Rapaport modification of the Goldstein-Gelb-Weigl Object-Sorting Test is used on a sample of 37 pairs of paranoid schizophrenics and nonpsychiatric patients to determine if schizophrenic thought reflects a marked loss of ability to conceptualize on an abstract level; or, is a disorder of communication. On the basis of the test results, the following conclusions are drawn: "(l)...our schizophrenic group demonstrated a loss of social communication without evidence of impairment in abstractive ability. (2) Differences in conceptualization in the object-sorting task were clearly more closely associated with estimated test intelligence and education than with the presence or absence of schizophrenia.".