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This special issue grew out of a workshop sponsored by the National Institute of Mental Health, the MacArthur Foundation, and the Child and Adolescent Psychosocial Interventions Consortium. The goals of the workshop are outlined. The contents of the special issue are then described: definitions of psychotherapy and its mechanisms of action, developmental issues in psychotherapy research, methodologies for the treatment of anxious youth, measurement of change in interventions, predicting the outcome of treatment, and advancing the efficacy and effectiveness of psychosocial treatments. Finally, some areas that need to be addressed in the future are discussed, such as process research, the effects of comorbidity on outcomes, intensity, and duration, and transferability of treatments.

Using a multimethod multistage screening procedure, the authors interviewed 201 parents and their children with the Diagnostic Interview Schedule for Children (DISC 2.1). In addition, parents completed the Child Behavior Checklist (CBCL) and other survey measures, while their children completed self-report scales. Receiver operating characteristic (ROC) analyses were done to determine optimal cutpoints on the CBCL, referenced to DISC diagnostic "caseness." DISC diagnoses, DISC "stem" symptoms, CBCL scores, and CBCL ROC-outpoints were compared against "external validators," in order to determine the comparative advantages of each approach for assessing child psychopathology. Overall findings suggest that the controversies about "best" assessment strategies may be artificial: When both assessment approaches are compared using similar methods, they are reasonably comparable. However, highly specific diagnostic categories may show fewer relationships with external validators and may therefore need more systematic validational studies.

This article introduces a special series on "transporting" studies of the efficacy of psychotherapy into studies of their effectiveness. Models of the relationship between efficacy and effectiveness are described. Traditional linear models of the phases of scientific expansion suggest that findings from efficacy studies can be transported into broader population samples only after a prescribed series of steps have been followed, with the ultimate goal of implementing treatments that have broad public health implications. An alternative 3-dimensional model is described. This new model posits as its organizing principle flexible movement between dimensions of efficacy and effectiveness across multiple axes.

In order to examine their relationship to Expressed Emotion, family environment and marital relationships were measured in the parents of disruptive, obsessive-compulsive, and normal children. Satisfactory family and martial environment were found to be related to low Expressed Emotion, while achievement orientation in mothers and greater family conflict were found to be significantly related to high Expressed Emotion.

A 2-year prospective follow-up study of 100% (N = 29) of a sample of children and adolescents with disruptive behavior disorders found that the baseline lumbar cerebrospinal fluid monoamine metabolite concentration and autonomic nervous system activity predicted some subsequent outcomes. The 5-hydroxyindoleacetic acid concentration significantly predicted severity of physical aggression during follow-up. The skin conductance level significantly predicted institutionalization. Correlations were in predicted directions with lower cerebrospinal fluid 5-hydroxyindoleacetic acid concentrations and autonomic activity correlated with poor outcome. Moreover, in multivariate analyses, which included nonlaboratory measures as predictors, cerebrospinal fluid and autonomic measures still contributed significantly to the prediction. However, hypothesized predictions of cerebrospinal fluid 5-hydroxyindoleacetic acid concentrations for suicide attempts and of low autonomic nervous system activity for arrests were not supported thus far. Patients are still at risk; consequently, these results must be considered preliminary. Nonetheless, the results suggest that further investigation of relationships between biological factors and outcome of children with disruptive behavior disorders is warranted.

Increased spontaneous fluctuations in skin conductance (SC) in adult schizophrenics have been associated with high expressed emotion (EE) in their relatives. This is the first study in children where parental EE, parental psychopathology, and autonomic activity, indexed by SC levels and reactivity, have been assessed. The subjects were children and adolescents with disruptive behaviour disorders (DBD, n = 35), a psychiatric contrast group with obsessive-compulsive disorders (OCD, n = 42) and normal controls (NC, n = 45). Children living in homes with two high-EE parents had higher SC activity during rest period and slower adaptation to relaxation. Fathers' EE and maternal psychiatric diagnosis were related to higher SC activity, especially for the OCD group.

Both high expressed emotion (EE) and psychiatric disorders were frequent in the parents of children and adolescents with disruptive behavior disorder (DBD, N = 34) and obsessive compulsive disorder (OCD, N = 49) compared to normal controls (NC, N = 41). Parental psychiatric diagnosis was significantly related to high-EE in fathers (p = .0002) and mothers (p = .0001) of all groups combined, and in parents of the ill groups (p = .03). Absence of diagnosis was associated with low-EE in fathers (p = .0006) and mothers (p = .04) of the controls. Psychiatric diagnosis was the only significant predictor for high-EE in fathers, while for mothers child's diagnosis was a stronger predictor.

About half of adults volunteering as normal control research subjects may be rejected because of significant psychopathology, but no parallel study has been done to date for pediatric subjects. Of 152 applicants (ages 6 to 18) for participation as paid normal controls, 44% were found ineligible and at least 31.8% of the child volunteers had probable or certain psychiatric disorders. Successive screenings, including rating scales and structured interviews, were necessary to obtain controls meeting a defined standard of psychiatric health. Careful scrutiny of child volunteers in biological psychiatric research is needed to assure meaningful comparisons.

Cerebrospinal fluid levels of 5-hydroxyindoleacetic acid, a metabolite of serotonin, were measured in relation to aggression, impulsivity, and social functioning in 29 children and adolescents with disruptive behavior disorders. The cerebrospinal fluid 5-hydroxyindoleacetic acid level was low compared with that of age-, sex-, and race-matched patients with obsessive-compulsive disorder. Within the disruptive group, significant negative correlations with age-corrected 5-hydroxyindoleacetic acid level were seen for the child's report of aggression toward people and the expressed emotionality of the child toward his or her mother; other correlations of age-corrected 5-hydroxyindoleacetic acid level with measures of aggression were in the expected negative direction but did not reach statistical significance. Impulsivity per se and socioenvironmental factors were not significantly related to cerebrospinal fluid 5-hydroxyindoleacetic acid concentration.

Hostile, impulsive, and aggressive behaviors have been associated with decreased urinary free cortisol (UFC) output. This is the first study to assess 24-hour UFC output in disruptive behavior disorders. The UFC of 19 boys with attention deficit and/or conduct disorder was compared with that of 19 age, race, and IQ matched normal controls studied as inpatients. Continuous Performance Test scores showed greater impulsivity in the disruptive group. UFC output did not differ between groups. However, UFC and difficulty were positively correlated on the continuous performance test in the form of longer interstimulus intervals and longer reaction times.