Impairment in Communication

• Difficulty in understanding/comprehending language
• Marked impairment in expressive language
• Limited ability to initiate or sustain a conversation

Impairment in Social Interaction

• Impairment in the use and understanding of nonverbal behaviours such as eye contact, facial expression, body postures, and gestures to facilitate social interactions
• Lack of spontaneous interaction
• Lack of social or emotional understanding
• Lack of varied, spontaneous pretend or social imitative play

Challenging and Stereotyped Patterns of Behaviour

• Preoccupation with one or more stereotyped and restricted patterns of interest, that is abnormal either in intensity or focus
• Inflexible to change
• Repetitive motor actions