Quantitative correlation between student use of office hours and course performance

University courses with a significant computing component typically provide support for student learning in the form of open lab hours attended by instructional staff. Students visit the open lab to work on computer-based assignments, and staff address questions as they arise, thereby providing just-in-time instruction and removing barriers to student progress. We have developed an online queuing system that we use to schedule student assistance in many of our core computing courses. While electronic queuing systems have been used in computing labs for decades, our web tool is instrumented to record a complete historical log of interaction times between students and staff. The analysis presented in this paper is our first attempt to understand who uses the open labs, and when, and what benefit they receive by doing so.