Gillberg's Criteria for Asperger's Disorder (Syndrome)

1.         Severe impairment in reciprocal social interaction (at least two of the following)

            a) inability to interact with peers

            b) lack of desire to interact with peers

            c) lack of appreciation of social cues

            d) socially and emotionally inappropriate behavior

2.         All-absorbing narrow interest (at least one of the following)

            a) exclusion of other activities

            b) repetitive adherence

            c) more rote than meaning

3.         Imposition of routines and interests (at least one of the following)

            a) on self, in aspects of life

            b) on others

4.         Speech and language problems (at least three of the following)

            a) delayed development

            b) superficially perfect expressive language

            c) formal, pedantic language

            d) odd prosody, peculiar voice characteristics

e) impairment of comprehension including misinterpretations of literal/implied meanings

5.      Non-verbal communication problems (at least one of the following)

         a) limited use of gestures

         b) clumsy/gauche body language

         c) limited facial expression

         d) inappropriate expression

         e) peculiar, stiff gaze

6.      Motor clumsiness: poor performance on neurodevelopmental examination

All six criteria must be met for confirmation of diagnosis.