This paper addresses the issue of whether serious emotional disturbance in children can be distinguished reliably from social maladjustment. Educational authorities at the local, state, and federal levels have expressed concern over the inclusion of socially maladjusted youths in special education programs for the seriously emotionally disturbed. For multidisciplinary teams to enforce the exclusionary clause of PL 94-142, which denies socially maladjusted students services for the seriously emotionally impaired unless it is determined that they are seriously emotionally disturbed, practitioners must be able to distinguish between these two conditions. The literature on taxonomies of childhood psychopathology was reviewed and a set of items based on research and clinical experience was developed to differentiate between these two groups. These items were submitted to eight school psychologists. Eleven items met the criterion of agreement by at least six of the eight psychologists. Implications for school psychologists are discussed. This paper deals with the controversial issue of whether it is really possible to distinguish between serious emotional disturbance (SED) and social maladjustment (SM). Its purpose is to attempt clarification of one aspect of the federal definition, namely that part dealing with the exclusionary clause stating that SM youth who are not also SED are ineligible for special education services.Public school personnel are concerned about the inability to distinguish between these two distinct but overlapping groups, only one of which is eligible for special education services. This concern is felt both at the state and federal levels. In Florida, a recent class action suit was filed in federal court on behalf of 8,000 predominantly black students who were placed in alternative schools due to their disruptive behavior. In essence, the suit charged that these students were denied the protections and services of PL 94-142 because the state used an exclusionary clause similar to the federal socially maladjusted exclusion. The case was settled out of court in favor of the plaintiffs, based largely on the testimony that disputed the differentiation of SM from SED and the assertion that SM are handicapped by their behavior (Benson, Edwards, Rosell, &