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is required to determine if a person is suffering from ADHD. A diagnosis is made according to the signs that first appeared before the age of 12 and can be a significant hindrance to school, work or social interactions. Rating scales are commonly used tools for assessing ADHD. The CAARS-L:S self-rating instrument has established validity. The version that is a observer (CAARS-L O) also has a high degree of validity. Symptoms Many children have trouble sitting still or waiting their turn, they are frenzied and