Diversity in the classroom impacts educators across the globe. Partners, led by a support service in Brussels, Belgium, agreed to a three year project titled Use Diversity to Enhance Learning in the 21st Century (UDEL 21). This resource brings together a consortium of K-12 educators, service providers for schools and university educators from Austria, Belgium (Flanders and Wallonia), Czech Republic, Italy and Slovenia. Together, they are establishing an overall common frame of reference on diversity and are using the UDL framework to guide the development of tools (e.g., class activities, narratives and file cards). All tools are written down in an accessible and simple template and the procedures are based on the UDL guidelines. The partnership also provides national and international inservice trainings. This resource provides an overview of the project, its outcomes, and the UDL training provided to the project partners to enhance their use of the framework in the design of their tools.