A friend works for a company that is still using Stonewall guidance to design policies. She'd like to write a letter to explain why this is not a wise choice, but needs some reliable resources to back herself up.
I've searched through a few threads and found a couple of articles (e.g. "Support for Stonewall Crumbles after Cass Review" in the times), but is there anything else out there to help form a reasoned argument against using Stonewall?