Description: 2021 Oklahoma OER Summit:  Jamie Holmes and Adam Brennan (Tulsa Community College), Calantha Tillotson (University of Tennessee at Knoxville; formerly of East Central University), and Sarah Burkhead Whittle (Northeastern State University) share their experiences working together to create an open textbook on Pressbooks. A useful case study for anyone interested in pursuing their own Open Educational Resources (OER) project, they will share their insights on early planning and choosing a team, meshing original with existing material, adding interactivity, and the editing and publishing process.