Quality and openness - open academic e-textbooks for STEM

The article presents open academic e-textbooks for STEM subjects as a mean for quality assurance in higher education in Poland. Authors present the assumptions for the open e-textbooks and their quality assurance mechanisms that have been planned and implemented based on the results of research in the project "Open AGH e-textbooks", launched in May 2013. The article focuses on the idea of modularity that makes possible the creation of e-textbook individually by each user (from and beyond the academic community), the aspects of inclusion academic staff into development of e-textbooks from ready components and provision of them for their students. The technological and legal solutions that influence on quality in re-use process are discussed as well.