1. Logic encoded on one or more tangible non-transitory computer readable media for execution and when executed operable to: receive input path loss information indicating path losses among pairs of access points and frequency assignments for said access points; determine, for each of said pair of access points, likelihood of contention based on path loss between said pair and whether they share a common frequency assignment; and count a number of contending pairs of access points based on the likelihood of contention to determine a quality evaluation metric for said wireless network.