T his paper describes the properties of the PICS, a valid and reliable research instrument in which the source of information is restricted to parents' direct observations. It is used in parallel with separate instruments capturing observations made in the school situation. The PICS is a semistructured parent interview that uses a naturalistic context for probing into a child's behaviour in daily living situations; it provides coverage of the full range of symptoms of ADHD, ODD, and CD, in accordance with the criteria of the DSM-IV classification (1). The PICS interview
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