The single case archive: Review of a multitheoretical online database of published peer-reviewed single-case studies.

Case study methods are increasingly recognized as crucial methods to enhance understanding of the complexity of psychotherapy processes and as way to bridge the science-practice gap. The Single Case Archive (SCA) was constructed to facilitate access to the existing field of case study research for academic, clinical, and educational purposes. Cases were selected through systematic screening of relevant peer-reviewed journals in the field of psychotherapy research and rigorous snowball sampling. All cases meeting inclusion criteria were inventoried using the Inventory for Basic Information in Single Cases that maps study, patient, therapist, and therapy characteristics. About 3,471 cases from 175 peer-reviewed journals published between 1955 and 2019 were included in the SCA database. The SCA comprises cases from different theoretical backgrounds, discussing patients from different age categories, with different presenting problems going through a diversity of psychotherapeutic treatments that are studied using a range of methods. Cases differ strongly with respect to the amount of information that is present in the case study, and the field should pay more attention to ethical considerations like informed consent and providing relevant basic descriptive information. An online platform makes the SCA database searchable by researchers, clinicians, and students. In conclusion, the SCA is a unique resource that makes case studies more easily accessible, facilitates meta-studies and reviews of case studies, and stimulates methodological developments in the field of case study research. (PsycInfo Database Record (c) 2022 APA, all rights reserved).