The clinical definition defines that 'autism must manifest delays in "social interaction, language as used in social communication, or symbolic or imaginative play," with "onset prior to age 3 years", according to the Diagnostic and Statistical Manual of Mental Disorders'. The must manifest before the age of three years to be clinically recognized; this is stated in the ICD-10, which is a set of criteria for the proper diagnosis. It is possible for children affected by autism to improve their social skills to a level where they can be fully integrated with mainstream events without any notice. Often times the case is that individuals affected by autism are un-willing to want to cure their condition because they see it as a part of who they are, and do not want to lose that.