For the recently initiated third follow-up at age 20, we repeat the clinical assessment in twins, who now visit without their parents. We have supplemented their DICA-R ADHD assessment with probes reflecting adult manifestations of ADHD symptoms (Adler et al., 2006). In addition, to enhance our assessment of risk in females, we have added an assessment of borderline personality disorder using the borderline module from the SIDP-IV (Pfohl et al., 1997) and the PAI-BOR scale from the Personality Assessment Inventory (Morey, 1991).