The Dimensions of Success observation tool, or DoS, pinpoints twelve indicators of STEM program quality in out-of-school time. The DoS observation tool consists of detailed explanations of each dimension and a 4-level rubric defining a range of quality associated with the dimension. Once certified, observers visit sites that are enacting STEM activities and take detailed field-notes. They then use the rubrics to assign ratings for each dimension that are backed up with evidence from the observation. Scores can then be aggregated across settings in particular geographic regions to look at trends or used for feedback and coaching at a particular site. All DoS observers must complete training and certification steps to maintain the reliable and valid use of the tool in the field.