Over the past few years, organizations around the world have invested in diversity, equity, and inclusion initiatives with varying results. But to achieve lasting change, they'll need to commit to that work for much longer, says Ella Washington, organizational psychologist and professor at Georgetown University’s McDonough School of Business. Her research shows that companies move toward DEI maturity in five stages (aware, compliant, tactical, integrated, and sustainable) and each takes time to work through. She explains why some organizations get stuck, and how to overcome those challenges. Washington is author of "The Necessary Journey: Making Real Progress on Equity and Inclusion" and the HBR article "The Five Stages of DEI Maturity."