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<i>Background:</i> The Adolescent Drug Abuse Diagnosis (ADAD) has been a gold standard for assessing drug use and associated problems in adolescents. Criticism of the instrument has been increasing. A new instrument, the European Adolescent Assessment Dialogue (EuroADAD) that builds on ADAD's strengths but seeks to address its limitations is now available, but has not been subjected to comprehensive psychometric evaluation. <i>Objective:</i> To examine the psychometric properties of the EuroADAD across various settings in adolescent populations who developed or were at a high risk of developing substance use and psychosocial adaptation problems. <i>Participants and Settings:</i> Three of the samples were collected in Hungary, including: institutionalized youths from juvenile residential facility (n = 295); adolescents from outpatient psychiatry facility (n = 278), and controls (n = 59). An additional sample was collected in the Netherlands, and consisted of adolescent boys from an independent residential institution for youth with severe behavioral problems (n = 51). <i>Procedure:</i> The EuroADAD was administered by trained interviewers. Data were collected through face-to-face interviews and self-report questionnaires. <i>Results:</i><i>Reliability:</i> the intraclass correlation was high for all domains of the EuroADAD; reliability analyses indicated good test-retest reliability, and internal consistency. <i>Validity: </i>difference among study samples was significant (p < 0.05) for the majority of the domains, with juvenile institution and psychiatric outpatient subjects exhibiting higher severity in most areas compared to controls. The Hungarian and Dutch samples were comparable, expect for the legal domain, due to the higher severity of behavioral problems in the Dutch sample. Several domains of the instrument, including 'alcohol', 'drugs' and 'legal' showed an association with trait aggression as measured by the Buss-Perry Aggression Questionnaire and with Novelty Seeking on the Cloninger Temperament and Character Inventory. <i>Conclusion:</i> Based on the pattern and significance of group differences, and correlations with other measures, the scale has good criterion, and convergent and discriminant construct validity. The EuroADAD is a reliable and valid tool for the assessment of alcohol and drug use, and related psychosocial problems in adolescents.

<i>Aim:</i> The study investigates patterns of cocaine powder and crack cocaine use of different groups in nine European cities. <i>Design, Setting, Participants:</i> Multi-centre cross-sectional study conducted in Barcelona, Budapest, Dublin, Hamburg, London, Paris, Rome, Vienna, and Zurich. Data were collected by structured face-to-face interviews. The sample comprises 1,855 cocaine users out of three subgroups: 632 cocaine users in addiction treatment, mainly maintenance treatment; 615 socially marginalized cocaine users not in treatment, and 608 socially integrated cocaine users not in treatment. <i>Measurements:</i> Use of cocaine powder, crack cocaine and other substances in the last 30 days, routes of administration, and lifetime use of cocaine powder and crack cocaine. <i>Findings:</i> The marginalized group showed the highest intensity of cocaine use, the highest intensity of heroin use and of multiple substance use. 95% of the integrated group snorted cocaine powder, while in the two other groups, injecting was quite prevalent, but with huge differences between the cities. 96% of all participants had used at least one other substance in addition to cocaine in the last 30 days. <i>Conclusions:</i> The use of cocaine powder and crack cocaine varies widely between different groups and between cities. Nonetheless, multiple substance use is the predominating pattern of cocaine use, and the different routes of administration have to be taken into account.