European funders detail their open-access plan | Science

Plan S, the contentious program that a group of European science funders hopes will end scholarly journals' paywalls, has fleshed out its rules—and softened its tone a bit. In seven pages of implementation guidance released this week, the funders explain how grantees can abide by Plan S. But some critics say the document—which is up for public discussion for 2 months—remains too restrictive.