Certainly reclamation plans are filed at the front end of our projects that document how we're going to commit to restore the landscape after our use of it, but it is adaptive management. To Murray's point, it is learning by doing.
I think over time what you're seeing is that the science of reclamation has advanced tremendously. The techniques of reclamation that are being applied today are very different from ones that would have been done 40 years ago. The effort is to approximate as closely as possible the regional landscape as it existed before. You would see a progression of science of reclamation from those early days to what we do today.