This 40-item questionnaire is the result of an investigation into the psychological and physiological experiences, which differentiate the “Psychoneurotic” from the “Normal”. The PPSI is designed for use with the late adolescent or adult groups of either sex. It has been found useful in the detection of neurotic tendencies in the individuals. The division of questions permits the user to discover whether the predominating dysfunction is psychological or physiological in nature. This test is for 16 years and above, and takes about 15 minutes to complete.