A Roadmap to Large-Scale Multi-Country Replications in Psychology

Classic findings from psychology and the behavioural sciences are increasingly being revisited. Methodological and technological advances provide opportunities to replicate studies across a wide range of countries and settings to investigate whether these findings are universally applicable, limited to specific countries, or vary in magnitude depending on settings. Researchers from around the world connect to revisit such findings collaboratively, adapt the original design to the Zeitgeist, integrate new knowledge to improve statistical analyses, and broaden the scope by testing effects globally – or at least in as many countries, as budget and feasibility allow. We currently observe multiple international consortia conducting large-scale multi-country replications. How do such collaborations form and how do they approach these complex investigations? This paper brings together researchers from different initiatives that conduct replications on an international scale to outline approaches and summarises what we have learned in applying them: Junior Researcher Programme (JRP), Psychological Science Accelerator (PSA), ManyBabies, Collaborative Open-science REsearch (CORE), and International Study of Metanorms (ISMN). We describe different ways for study selection, methodological approaches, statistical analyses, ethical issues, and most importantly, how the different collaborations formed and how team communication worked. We look in detail at challenges of including typically underrepresented countries in psychological science, not only in terms of data collection but also in making it possible for local researchers to contribute. This paper provides a structured insight into how different collaborations work and issues to consider for anyone who seeks to conduct a multi-country replication in psychology, or looking for additional perspectives to their existing plan. We close the article with a checklist built as a helpful tool for colleagues putting together their study protocols for such efforts – and invite them to collaboratively expand it in the future.