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ADHD Evaluation To determine if a person is ADHD, an assessment is required. The diagnosis is according to the signs that first appeared before 12 years of age and cause significant disruption to work, school, or social situations. Rating scales are widely used instruments for assessing ADHD. -L-S is a self rating instrument with established validity. The observer version (CAARS-L O) also has good validity. Signs and symptoms Many children have difficulty sitting