Certainly. I can start and other colleagues may wish to weigh in.
Essentially, we know our operational tempo was down—workers in buildings, actual activity with our vehicles, and things like that. Travel was way down. It's back up this year to about 80% of prepandemic. That was the data that went into it. TBS, as was already mentioned, provided departments with some models and tools, but I'm not sure.
Saleem, do you want to add details about the methodology itself?