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Although generally overlooked in mentally retarded individuals, the occurrence of Tourette Syndrome (TS) in seven such children is documented here. These subjects also shared a very early and persistent severe behavior disorder consisting of hyperactivity, agitation, aggressivity, and noncompliance. Correct diagnosis of TS is important to appropriate treatment, rather than assuming that motor and phonic tics and other associated TS symptoms are necessarily a function of a more pervasive developmental disorder in a disturbed mentally retarded person.

Although typically regarded as equivalent instruments, the WISC‐R and the WAIS‐R yield significantly different Verbal, Performance, and Full Scale IQs for an intellectually subaverage group, with the WAIS‐R consistently providing higher scores. Implications of this “built‐in” increment for issues of eligibility for educational placements and societal benefits are serious, and careful interpretation of IQs in the context of other relevant data is necessary.

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