Soon there will be a "live chat" with the candidates. At that time I plan on asking this question:
"I'd like to know about your experience with community-based projects. Please tell us about a project that you took responsibility for seeing through to completion (i.e. did most of the work). Please, only projects that are "done" or have reached a self-sustaining mode only. One or two sentences is fine. It doesn't have to be a project where you thought of the idea, just one where you assured it reached the finish line."
I look forward to reading their answers.