Though the presentation of symptoms with autism can vary quite a bit, there are specific behaviors necessary for diagnosing it. Impairment in reciprocal social interaction must be present. We often envision a child with autism as avoiding eye contact or perhaps as using people as they would inanimate objects. Communicative deficits also must be present for an ASD to be diagnosed. There are well-documented specific problems in communication such as incorrect usage of pronouns, but the range of impairment in this area is great and can include the absence of any functional communication skill. Repetitive behaviors and/or marked adherence to specific routines also must be present for an ASD to be diagnosed. Stereotypic behavior is quite prevalent in persons with autism and recent research indicates that though these repetitive behaviors occur during typical development, they tend to persist in children with autism beyond the developmental stages at which they are usually replaced by more functional behavior. Symbolic play deficits have also been noted to be common in children with autism.