From 2015 to 2023, eight years of empirical research on research integrity: a scoping review.

Background: Research on research integrity (RI) has grown exponentially over the past several decades. Although the earliest publications emerged in the 1980 s, more than half of the existing literature has been produced within the last five years. Given that the most recent comprehensive literature review is now eight years old, the present study aims to extend and update previous findings.

Method: We conducted a systematic search of the Web of Science and Constellate databases for articles published between 2015 and 2023. To structure our overview and guide our inquiry, we addressed the following seven broad questions about the field:-What topics does the empirical literature on RI explore? What are the primary objectives of the empirical literature on RI? What methodologies are prevalent in the empirical literature on RI? What populations or organizations are studied in the empirical literature on RI? Where are the empirical studies on RI conducted? Where is the empirical literature on RI published? To what degree is the general literature on RI grounded in empirical research? Additionally, we used the previous scoping review as a benchmark to identify emerging trends and shifts.

Results: Our search yielded a total of 3,282 studies, of which 660 articles met our inclusion criteria. All research questions were comprehensively addressed. Notably, we observed a significant shift in methodologies: the reliance on interviews and surveys decreased from 51 to 30%, whereas the application of meta-scientific methods increased from 17 to 31%. In terms of theoretical orientation, the previously dominant "Bad Apple" hypothesis declined from 54 to 30%, while the "Wicked System" hypothesis increased from 46 to 52%. Furthermore, there has been a pronounced trend toward testing solutions, rising from 31 to 56% at the expense of merely describing the problem, which fell from 69 to 44%.

Conclusion: Three gaps highlighted eight years ago by the previous scoping review remain unresolved. Research on decision makers (e.g., scientists in positions of power, policymakers, accounting for 3%), the private research sector and patents (4.7%), and the peer review system (0.3%) continues to be underexplored. Even more concerning, if current trends persist, these gaps are likely to become increasingly problematic.