News & Views: Open Access Mandates and Open Access Adoption

As more funders implement or consider mandates, we were curious whether the data show any connection between funders’ open access policies and open access uptake.
Introduction
The Registry of Open Access Repository Mandates and Policies (ROARMAP) is a searchable international registry charting the growth of open access mandates and policies adopted by universities, research institutions, and research funders. It tracks the policies requiring or requesting researchers to provide open access to their peer-reviewed research article output. It focuses on policies about use of repositories, but also captures information about OA publishing.
By comparing the number of policies in ROARMAP with proportion of output that is open access, we can see whether a relationship exists between policy activity and OA uptake. We define OA to include articles that are both free to read and reuse, in all journal types. We exclude public access (“bronze”). As we want to examine market activity, we also exclude repository-only versions of articles.
Policies and Uptake
Figure 1, below, shows how numbers of policies and the proportion of output that is open access track over time. The blue bars show the cumulative number of policies (left axis). The orange line shows the proportion of articles that are OA (right axis).

Sources: ROARMAP, Crossref, Unpaywall, Delta Think Analysis.
Clearly both are growing and there is a strong correlation overall. However, the two sets of numbers follow slightly different trajectories:
- The numbers of policies appear to follow a classic S-shaped curve. A burst of steep growth from around 2009 to 2018 is flattening off. For example, in 2013 and 2014 growth was around 20% per year. Last year it was 1%.
- The proportion of OA articles appear to follow more of a shallow hockey stick. Its initial growth curve has given way to a straighter line.
Although both curves are broadly similar, it seems that they diverge in the detail. The number of OA policies grew faster than OA uptake around 2001 to 2017. But we have since seen a turnaround. The proportion of OA continues to increase apace, even though the numbers of policies have almost reached a steady state.
Growth can be hard to judge from absolute numbers. For example, the straight line above actually points to slowing growth. (Constant growth compounds and would show as an exponential curve.) Figure 2 below compares the annual changes in both measures.

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