Reliability of structured interviews for the assessment of challenging behaviour

While structured behavioural interviews are often used in the assessment of problem behaviours among persons with developmental disabilities, there are no data on the reliability of this assessment methodology. In the present study, the reliability of a 15 item interview protocol was determined by comparing the answers provided by different staff concerning the aggressive behaviours displayed by 18 persons with severe disabilities. Agreement was generally low with an overall mean of 43% across clients and questions. The results suggest that information obtained from structured behavioural interviews should be verified by direct observation.