- A total of six (or more) items from heading (A), (B), and (C), with at least two from (A), and one from (B) and (C):
- Part A: Qualitative impairment in social interaction, as manifested by at least two of the following:
- Marked impairments in the use of multiple nonverbal behaviors such as eye-to-eye gaze, facial expression, body posture, and gestures to regulate social interaction.
- Failure to develop peer relationships appropriate to developmental level.
- A lack of spontaneous seeking to share enjoyment, interests, or achievements with other people, (e.g. by a lack of showing, bringing, or pointing out objects of interest to other people).
- A lack of social or emotional reciprocity.
- Part B: Qualitative impairments in communication as manifested by at least one of the following:
- Delay in or total lack of, the development of spoken language (not accompanied by an attempt to compensate through alternative modes of communication such as gesture or mime).
- In individuals with adequate speech, marked impairment in the ability to initiate or sustain a conversation with others.
- Stereotyped and repetitive use of language or idiosyncratic language.
- Lack of varied, spontaneous make-believe play or social imitative play appropriate to developmental level.
- Part C: Restricted repetitive and stereotyped patterns of behavior, interests, and activities, as manifested by two of the following:
- Encompassing preoccupation with one or more stereotyped and restricted patterns of interest that is abnormal either in intensity or focus.
- Apparently inflexible adherence to specific, nonfunctional routines or rituals.
- Stereotyped and repetitive motor mannerisms (e.g. hand or finger flapping, or twisting, or complex whole-body movements).
- Persistent preoccupation with parts of objects.
- Part A: Qualitative impairment in social interaction, as manifested by at least two of the following:
- Delays or abnormal functioning in at least one of the following areas, with onset prior to age 3 years:
- Social interaction
- Language is used in social communication
- Symbolic or imaginative play
- The disturbance is not better accounted for by Rett’s Disorder or Childhood Disintegrative Disorder.