A project was initiated to provide the nation’s 9,000 public libraries with a field-tested and replicable science literacy model that staff can adapt to engage their patrons in meaningful and relevant science experiences. This Guide advances library practice and empowers public library staff to effectively build their science literacy capacity. The hope is library patrons and their communities are better connected to informal science and technology experiences, equipment, books, media, and the scientific community. In addition to this guide, the grant project includes a Guide for State Library Agencies, online learning tool kits, and STEM resources for libraries. (Reference: https://stemlibraries.org/)