Recent developments in case study methodology reflect a rising interest that clinicians and researchers share in building a clinically useful and empirically sound knowledge base from single-case studies. The present article describes three types of single-case studies (clinical, experimental, systematic) and examines their potential contributions to psychotherapy research. It then lays out three ways in which single-case studies can be aggregated and synthesized to enhance clinical understanding: (a) a case database that allows clinicians to efficiently search for relevant cases, (b) a metasynthesis of single-case studies that integrates common themes across similar cases, and (c) an individual case comparison method in which closely matched cases are compared to identify both therapeutic and hindering processes.

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Accelerated experiential dynamic psychotherapy (AEDP) is an integrative model of psychotherapy that brings together relational and experiential work, with the aim of not only alleviating suffering but also bringing about flourishing. The present study took place within a developing AEDP practice research network and examined outcomes for 62 self-referred adults treated using a 16-session format of AEDP treatment. Participants completed self-report measures before and following treatment. Measures assessed a variety of psychological problems, subjective distress, as well as aspects of positive psychological functioning. Treatment occurred in naturalistic independent practice outpatient settings in the United States, Canada, Israel, Japan, and Sweden. Large effect sizes (d Ͼ 0.80) were obtained for clinical problems and subjective distress. The majority of patients evidenced clinically reliable change according to Jacobson, Roberts, Berns, and McGlinchey's (1999) criteria. Effectiveness was further examined by dividing the sample into a clinical group with pervasive and severe problems and a subclinical group with fewer problems and mild severity. Within the clinical group, total and global scores on all measures improved significantly following treatment. Effect sizes were d Ͼ 1.00 for all scales. The subclinical group also demonstrated significant improvements, with effect sizes ranging from d ϭ 0.46 to d ϭ 2.07. These results provide initial empirical support for the effectiveness of AEDP as a model of therapy that can effect meaningful and significant improvements across a range of psychological symptoms. Clinical Impact StatementQuestion: This study examines the effectiveness of accelerated experiential dynamic psychotherapy (AEDP), a transdiagnostic treatment for psychological problems and positive psychological functioning in independent practice settings. Clinical researchers and practitioners partnered in the development of an AEDP practice research network (PRN) model. Findings: Findings support the use of AEDP for a range of presenting problems and symptoms. Meaning: Results support the clinical application of AEDP across a variety of psychological problems and functionings and ongoing research using a PRN model. Next Steps: Future research will continue AEDP PRN initiatives and partnerships in independent practice settings and will investigate maintenance of therapeutic gains over a 6-and 12-month follow-up period.

Emotion-focused therapy (EFT) is an integrative approach to psychotherapy designed to foster clients' emotional processing skills and emotional literacy. This helps people better use and regulate their affect and thereby enhance their well-being (