The informativeness of the discourse of persons with aphasia (fluent vs. non-fluent) under structured and conversational tasks was investigated. Ten individuals, five with fluent aphasia and five with non-fluent aphasia, who had suffered a single left hemisphere stroke, participated. Structured and conversational discourse samples were analyzed using the Correct Information Units (CIUs) analysis system. Significant differences between structured and conversational tasks were observed when comparing total number of words and total number of CIUs. Participants with fluent aphasia performed better than those with non-fluent aphasia during the conversational task. No differences were found between the groups for total number of words, total number of CIUs, and percentage of CIUs during structured tasks.