This talk is about how we at the SLAC National Accelerator Laboratory (SLAC) picked Chef and how we’ve been rolling Chef out while maintaining the configuration management system (CMS) we already have in place. We’ve been rolling out Chef while maintaining our current CMS. We’ll explore what we’ve learned about our workflow while running two CMS, and why we picked Chef. Our transition has been going well, but a tad slower than we first thought. We discovered opportunities internally for making CMS quicker and more consistent, and externally for communicating with our users about changes afoot to the systems they use.