Many OER, especially open textbooks like those created by OpenStax, are developed through a rigorous production and peer review process that mirrors traditional methods. After production, OER can be updated, tailored, and improved locally to fit the needs of students. The OER community also crowdsources peer review, encouraging faculty to write reviews of OER materials they have used and post them online. An example of this is reviews for different works in the Open Textbook Library.