This document discusses ways for hardware and software vendors to engage with the Xen developer community by contributing testing, reporting bugs, suggesting features, and submitting code patches. It outlines the benefits of contributing as well as practical guidelines for submitting high-quality bug reports, questions, and patches that are more likely to be accepted into the Xen codebase. The goal is to enable greater involvement from external organizations to help drive further development of the Xen hypervisor.