‘Open Source’ Opportunities for Enhanced Collaboration in Psychotherapy Science Letter to the Editor, Commentary ‘Open Source’ Opportunities for Enhanced Collaboration in Psychotherapy Science Conal Twomey 1, Richard Cody 2, John A. Johnson 3, Gary O’Reilly 4 [1] Health Service Executive, Dublin, Ireland. [2] Púca Technologies Limited, Dublin, Ireland. [3] Department of Psychology, Pennsylvania State University, State College, PA, USA. [4] School of Psychology, University College Dublin, Dublin, Ireland. Clinical Psychology in Europe, 2021, Vol. 3(2), Article e6569, https://doi.org/10.32872/cpe.6569 Published (VoR): 2021-06-18 Corresponding Author: Conal Twomey, Ballyfermot & Palmerstown Primary Care & Mental Health Centre, Upper Ballyfermot Road, Dublin 10, D10 C973, Ireland. E-mail: conal.twomey@hse.ie According to Marvin Goldfried, psychotherapy remains an infant science characterised by a lack of consensus surrounding core and basic principles, research-practice disparity, and excessive theory-reinvention by competing schools of therapy (Goldfried, 2020). Goldfried’s concerns together point to suboptimal collaboration within the psychothera­ py research community. In our view, collaboration could be improved through the wider application of ‘open source’ software development principles (e.g., open access, free distribution, and unconstrained modification) to psychotherapy science. The origins of open source illustrate its promotion of collaboration. Initially, soft­ ware products were invariably perfected ‘behind-closed-doors’ before being released as copyrighted products. In the mid-1990s, however, the Internet enabled a new way of working: members of online developer communities started to freely share modifiable software source code with each other, leading to the creation of open and free networks of online collaboration (Raymond, 1999), and subsequently to the production of several high-quality software and Internet products (e.g., Linux and Wikipedia) and mainstream adoption across industries. Like open source, science is—at its best—an open, collaborative endeavor (Johnson, 2014). It is therefore unsurprising that open source has increasingly infiltrated science in recent years, most notably in the ‘open science’ movement, which promotes meth­ odological transparency and open access to data and research outputs (Vicente-Saez & Martinez-Fuentes, 2018); but also in the production of laboratory equipment (Pearce, 2014), off-patent medications (Woelfle et al., 2011), and psychometric questionnaires (Dworak et al., 2021; Goldberg et al., 2006). Regarding psychotherapy, journals routinely This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International License, CC BY 4.0, which permits unrestricted use, distribution, and reproduction, provided the original work is properly cited. https://crossmark.crossref.org/dialog/?doi=10.32872/cpe.6569&domain=pdf&date_stamp=2021-06-18 https://cpe.psychopen.eu/ https://www.psychopen.eu/ https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/ promote open-science practices, data from psychotherapy studies are often shared (e.g., in patient level meta-analyses), many outcome measures are freely available online, and there are an increasing number of open research networks. Regrettably given their potential to enhance the open collaboration inherent in good science, there exist few applications of open source principles to the development of psy­ chotherapy interventions. Most intervention manuals are not freely available online, lim­ iting access and creating a financial barrier to the exploration of manuals from different schools of therapy. Moreover, for the vast majority of psychotherapies, copyright control and vested interests discourage (a) the collaborative modification and distribution of new versions of intervention manuals, and (b) the collaborative combination of components from different schools of therapy into transtheoretical interventions, or ‘process-based therapies’ (Hofmann & Hayes, 2019). Regarding (a), such collaboration could be enabled if freely modifiable versions of intervention manuals were periodically released on open source platforms such as the Open Science Framework (https://osf.io). This would signpost progress and later facilitate the empirical comparison of different versions, in turn facilitating ‘component analyses’ that tap into basic principles. On a cautionary note, there is potential for the misuse of open source intervention manuals by unqualified persons and this should be closely monitored (Goldberg et al., 2006). Regarding (b), the vested interest of a school of therapy is to keep the learner within their school, so that the learner can eventually graduate as a proponent of the school’s teachings; however, the wider community interest is to build unifying theories that transcend the teachings of particular schools (Goldfried, 2020). Transtheoretical open source interventions provide a means for this theory unification. Funding: The authors have no funding to report. Acknowledgments: The authors have no additional (i.e., non-financial) support to report. Competing Interests: The authors have declared that no competing interests exist. R e f e r e n c e s Dworak, E. M., Revelle, W., Doebler, P., & Condon, D. M. (2021). Using the International Cognitive Ability Resource as an open source tool to explore individual differences in cognitive ability. Personality and Individual Differences, 169, Article 109906. https://doi.org/10.1016/j.paid.2020.109906 Goldberg, L. R., Johnson, J. A., Eber, H. W., Hogan, R., Ashton, M. C., Cloninger, C. R., & Gough, H. G. (2006). The international personality item pool and the future of public-domain personality measures. Journal of Research in Personality, 40(1), 84-96. https://doi.org/10.1016/j.jrp.2005.08.007 ‘Open Source’ in Psychotherapy 2 Clinical Psychology in Europe 2021, Vol. 3(2), Article e6569 https://doi.org/10.32872/cpe.6569 https://osf.io https://doi.org/10.1016/j.paid.2020.109906 https://doi.org/10.1016/j.jrp.2005.08.007 https://www.psychopen.eu/ Goldfried, M. R. (2020). The field of psychotherapy: Over 100 years old and still an infant science. Clinical Psychology in Europe, 2(1), Article e2753. https://doi.org/10.32872/cpe.v2i1.2753 Hofmann, S. G., & Hayes, S. C. (2019). The future of intervention science: Process-based therapy. Clinical Psychological Science, 7(1), 37-50. https://doi.org/10.1177/2167702618772296 Johnson, J. A. (2014). Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120. Journal of Research in Personality, 51, 78-89. https://doi.org/10.1016/j.jrp.2014.05.003 Pearce, J. M. (2014). Laboratory equipment: Cut costs with open-source hardware [Correspondence]. Nature, 505(7485), 618. https://doi.org/10.1038/505618d Raymond, E. (1999). The cathedral and the bazaar: Musings on Linux and Open Source by an accidental revolutionary. O’Reilly Media. Vicente-Saez, R., & Martinez-Fuentes, C. (2018). Open Science now: A systematic literature review for an integrated definition. Journal of Business Research, 88, 428-436. https://doi.org/10.1016/j.jbusres.2017.12.043 Woelfle, M., Olliaro, P., & Todd, M. H. (2011). Open science is a research accelerator. Nature Chemistry, 3(10), 745-748. https://doi.org/10.1038/nchem.1149 Clinical Psychology in Europe (CPE) is the official journal of the European Association of Clinical Psychology and Psychological Treatment (EACLIPT). PsychOpen GOLD is a publishing service by Leibniz Institute for Psychology (ZPID), Germany. Twomey, Cody, Johnson, & O’Reilly 3 Clinical Psychology in Europe 2021, Vol. 3(2), Article e6569 https://doi.org/10.32872/cpe.6569 https://doi.org/10.32872/cpe.v2i1.2753 https://doi.org/10.1177/2167702618772296 https://doi.org/10.1016/j.jrp.2014.05.003 https://doi.org/10.1038/505618d https://doi.org/10.1016/j.jbusres.2017.12.043 https://doi.org/10.1038/nchem.1149 https://www.psychopen.eu/