The challenges of addressing increasing calls for the inclusion of computational thinking skills in K-12 education in the midst of crowded school curricula can be mitigated, in part, by promoting STEM learning in after-school settings. The Visualization Basics: Using Gaming to Improve Computational Thinking project provided opportunities for middle school students to participate in after-school clubs focused on game development and LEGO robotics in an effort to increase computational thinking skills. Club leaders and teachers, however, first needed to develop proficiency with the computational