The scope of Plan S is primary peer reviewed research across all disciplines, including the natural and applied sciences (STEM), social sciences, and the arts and humanities. Plan S applies to all peer-reviewed publications that are based on results from research funded fully or partially by cOAlition S members. The current guidance specifies the principles of Plan S and provides paths for their implementation regarding scholarly articles. In Sept 2021 cOAlition S issued a statement on Open Access for academic books.