Computing has become an integral part of everyday practice within modern fields of science, technology, engineering, and math (STEM). As a result, the STEM+Computing Partnerships (STEM+C) program seeks to advance new approaches to, and evidence-based understanding of, the integration of computing in STEM teaching and learning. 'Making' is an emerging movement in which kids use technological tools to create hardware and software that solves personally relevant problems, using things like programmable circuit boards, arts and craft materials, and computers. Building on a broad set of maker spaces in Chicago, the Assessing Computational Thinking in Making Activities (ACTMA) project will develop curricula and assessments to see how kids can learn physics and computation through making. Experts in educational measurement, in broadening STEM participation, and in instructing makers will work together with kids to design materials that are culturally responsive to girls, Hispanic-Americans, and African-Americans.