The ACC Foundation DEI Maturity Model has been designed for use by legal departments around the world to benchmark maturity of their efforts regarding diversity, equity, and inclusion (DEI) across a wide range of functional areas that have been proven relevant for optimization of DEI impact and results. This first iteration of the DEI Maturity Model outlines clear descriptions for three levels of maturity for each DEI function – early, intermediate, and advanced – providing leaders with a critical snapshot of where their department compares against the maturity continuum, and offering a roadmap of how to achieve next-level goals. The DEI Maturity Model was jointly developed by ACC and the ACC Foundation, in consultation with an advisory committee of DEI leaders from the legal and business communities who are responsible for advancing DEI results at their organizations. While we are pleased to offer this tool in response to the need expressed by in-house counsel for practical, accessible approaches, we intend for this model to continue to be refined and improved upon based on the valuable feedback from those who use it.