Autism children have a challenge about understanding how to interact with others. They also have an impaired social cognition that makes it difficult to establish friendships and create positive social relationships. This problem can lead to desirable or undesirable behavior. So, this research aims to identify the desirable and undesirable behavior through several games with different interaction patterns, identify suitable physical activities that help interactions and intervention applicable

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... n reducing undesirable behaviors among children with autism. Data was obtained through document analysis and observations conducted. Samples of research consist of eight children with autism from age from 4 to 9 years old from different categories: mild, moderate and severe. Samples were selected by using purposive sampling from Autism children who have learning problems and show the most undesirable behavior reactions and participation in activities conducted at an Autism Centre. Data from observations were reported from several aspects such as the behavior that impede learning activity, as well as the frequency and duration of such specific behaviors. Besides that, some examples of useful activities as interventions to reduce undesirable behavior are presented following the three categories.