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A	Characteristic symptoms: Two or more of the following, each present for a significant portion of time during a one-month period: delusions hallucinations disorganised speech (eg, frequent derailment or incoherence) grossly disorganised or catatonic behaviour negative symptoms (ie, affective flattening, alogia, or avolition).
Note	Only one Criterion A symptom is required if delusions are bizarre or hallucinations consist of a voice keeping up a running commentary on the person's behaviour or thoughts, or two or more voices conversing with each other.
B	Social/occupational dysfunction: Since the onset of the disturbance, one or more major areas of functioning, such as work, interpersonal relations, or self-care, are markedly below the level previously achieved.
C	Duration: Continuous signs of the disturbance persist for at least six months. This six-month period must include at least one month of symptoms (or less if successfully treated) that meet Criterion A.
D	Exclusion of schizoaffective disorder and mood disorder with psychotic features.
E	Substance/general medical condition exclusion: the disturbance is not due to the direct physiological effects of a substance (eg, a drug of abuse, a medication) or a general medical condition.
F	Relationship to a pervasive developmental disorder: If there is a history of autistic disorder or another pervasive development disorder, the diagnosis of schizophrenia is made only if prominent delusions or hallucinations are also present for at least a month (or less if successfully treated).

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