Dimensions of Success (DoS) is an overarching framework that defines key aspects of a quality STEM learning experience.  DoS forms the backbone of a suite of tools and guides designed to help out-of-school-time (OST) programs (e.g., afterschool programs, summer camps, etc.) improve the quality of their STEM offerings. It was developed and studied with funding from the National Science Foundation (NSF) by The PEAR Institute, along with partners Educational Testing Services (ETS) and Project Liftoff. The DoS suite of tools allows researchers, practitioners, funders, and other stakeholders to track the quality of STEM learning opportunities and to pinpoint strengths and weaknesses. The Dimensions of Success observation tool is a validated research tool, with a validation paper published in Science Education.