We were officially a Summit-D shop a few years ago, but it had no OO track at the time so we were encouraged to use RUP for most of the stuff related to actually building software. We still used some of the Summit-D terms and documents at project inception and to interface with other groups who still use it. Somewhere in there we purchased a subsidiary with its own methods, so for a while we had three "official" processes to follow. Yikes! I think we are officially a RUP shop now.
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi