How can software practitioners assess whether their software supports diverse users? Although there are empirical processes that can be used to find "inclusivity bugs" piecemeal, what is often needed is a systematic inspection method to assess soft-ware's support for diverse populations. To help fill this gap, this paper introduces InclusiveMag, a generalization of GenderMag that can be used to generate systematic inclusiveness methods for a particular dimension of diversity. We then present a multi-case study covering eight diversity dimensions, of eight teams' experiences applying InclusiveMag to eight under-served populations and their "mainstream" counterparts.