Based on findings that, like schizophrenic children, children with complex partial seizure disorder have illogical thinking, this study examined whether or not these same epileptic subjects had other thought processing impairments found in schizophrenic children. Compared to normal children (N = 38), both the epileptic (N = 27) and schizophrenic children (N = 31) underutilized discourse (cohesive) devices that make speech coherent. The severity of the discourse deficits and formal thought disorder of the schizophrenic children was associated with age, but not with IQ scores. Age, IQ, and seizure-related, not behavioral variables, were associated, however, with the severity of the discourse deficits of the epileptic subjects. The study' findings suggest that measures of impaired thought processing and communication in schizophrenic children could be a model to study the developmental impact of complex partial seizure disorder in middle childhood. The clinical implications of the study's findings are discussed.