Examined the sufficiency of the positive/negative distinction for accommodating the full range of schizophrenic symptoms. A well operationalised 30-item scale (Positive and Negative Syndrome Scale) was administered to 150 subjects (aged 18-50 years) with schizophreniThe thirty items were then subjected to principal component analysis. Results showed that the positive/negative distinction alone was insufficient to account for the heterogeneity of schizophreniOther dimensions such as depression and excitement may further account for multiplicity of symptoms in this disorder.