Evaluated the communicative deficits in the linguistic performance of 2 Arabic speaking schizophrenics (aged 15 & 16 yrs) having a 1st episode of disorganized schizophreniTwo facets of the conversational performance of each patient prior to and following antipsychotic medication treatment were considered and compared to normal controls' performance of these 2 measures: the dynamic development of the interviews, and selected cohesive devices. A description of the patients' aberrant conversational behavior and deficits in terms of systemic grammar is offered for profiling schizophrenics' discourse and measuring the effects of stimulant treatment. The neuroleptic clozapine led to both positive and negative changes in the socially appropriate use of language in the schizophrenics' conversations.