This document summarizes a study on the development and implementation of open textbooks at Thompson Rivers University Open Learning. It finds that there is no single approach, as multiple factors need to align, including institutional support, willing faculty authors, available open resources, and sustainability planning. While open textbooks allow for improved currency and collaboration, they also present challenges to version control, distribution, developing for reuse, and long-term funding. Further research is needed to understand how open textbooks are being used over time and identify sustainable business models.