I'm playing with the idea of a global and local rules family, where local rules are the children and global rules the grandparents. The parents are the middle rules. In other words, the local rules are subsets of global and middle rules.
The goal - provide the project manager with a family of options. If a local rule is best but would prefer a more global solution, find its global and middle relatives and see if they work just as well.
My initial experiment is a little flawed by my simple rule score metric, P(defects), but results are useful.