Open educational resources (OER) can make educational resources widely available to all students and educators for free; however, OER are still untried in many academic programmes in higher education. This article reports a case of adoption of an open access textbook for an introductory information systems course and discusses the process and suggestions of adoption of an OER textbook based upon the authors' own experience. The study indicates that the process of adoption of an open access textbook demands more intellectual work on the instructors' side in comparison with the adoption of a new commercial textbook. The study suggests that discipline-based communities of practice (CoP) can ease the workload problem in the process of adopting OER textbooks. The findings are important in encouraging the OER community to shift from project-based OER textbook development to discipline-based CoP for effective OER textbook adoption.