EdLeader21 is a national network of school and district leaders focused on integrating the 4Cs (critical thinking, communication, collaboration and creativity) into education in order to ensure students readiness for college and career. Jeffco Schools is a district member which affords Ralston collaboration access to leading schools across the United States. It also gives us access to rubrics for the 4cs that align indicators for K-2, 3-5 and 6-8th grades. In 2014-15, and again this school year, we are working with several school districts to pilot a problem based assessment in science, literacy and critical thinking. The assessment charged students with creating an earthquake evacuation plan for the city leaders of Dhaka. While considering what they knew about earthquakes, students had to analyze and recommend practices to ensure the safety of citizens. The collaboration helps us to focus on “what mastery looks like” for each standard. It also promotes a process to ensure best practices in assessment that we can now apply across the curriculum.