Guess, Roberts, Behrens, and Rues (1998) presented reliability data from recordings of behavior state using a 13-category coding system. Interobserver agreement was reported at 63% to 91% across categories. In an attempt at replication, we found lower levels of reliability (0% to 80%). To determine the reasons for different results, we obtained measurements of behavior states from video-recordings by five of Guess et al.'s observers. Again, replication was unsuccessful. Obtained mean percentage agreement on occurrence for individual behavior states and participants ranged across observer pairs from 0% to 58% (kappa range was 0 to .64). Some possible reasons for failures to replicate are discussed.

Lemon juice contingently dispensed following self‐induced vomiting was found to effectively suppress this behaviour in a profoundly retarded multiply handicapped child. The programme was carried out by a teacher in the Special Care class of an ESN(S) school.

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