Bannister and Fransella (1966) described a clinical test based on the theory and methods of Kelly (1955). This test has since been widely used in clinical practice, usually as a test of schizophrenic thought disorder, and has also been used in several studies attempting to define the schizophrenic condition more exactly (e.g. Bannister and Salmon, 1966; McPherson and Buckley, 1970; McPherson, 1969). The test was developed from the previous work of Bannister (1960, 1962) with schizophrenics and other psychiatric patients.