A screening score of 22 symptoms, primarily psychophysiological, but dealing also with feelings of depression and withdrawal, was selected on the basis of discrimination between known ill and well groups, and on their correlation with a psychiatric judgement of impairment based on a case summary of which they were a part. This instrument may find some use in screening large population groups for potential psychiatric cases, or in comparing population sub-groups directly with a view to deriving etiological clues.