This sifting is not an exact science. We are not mixing chemicals where there's pretty much a known reaction and response. This is more like surgery--sometimes you don't know what you are getting into until "you open things up."
If I'm using compiled trees for clues, I tend to loosely put the trees into three categories:
- no sources
- files as sources (stuff.GED, stuff2.FTW, stuff3,RTM, etc.)