Participants emphasized the importance of frequent communication among collaborators, both for small team projects and large cross-center collaborations to help develop shared goals and mutual understanding. They emphasized the value of face-to-face meetings. I think that it was a series of different [events] -- it was the TREC meetings; it was [center level] meetings; it was some of the national meetings that TREC sponsored and participated in with NCI; it was personal conversations that we had. So it's hard to identify one particular event. But I think it was really a series of different events and conversations and discussions and arguments that transformed all of us so that we still recognize the differences but there's more respect and understanding and less intimidation. ... I think we've gotten to the point where we understand enough that we ... can pay attention and recognize, “oh, there's something important there. That is real science, after all.”