Glad you made your comment, but I was thinking more broadly than any specific treatment modality.
You see, I'm trying to set up a peer support service for survivors of trauma, abuse and childhood adversity, being both a former psychologist, now retired, and a survivor myself.
Some "standards" do exist, although maybe not often spoken of as such, such as if you're a survivor - group facilitator you should be able in some way to talk about your own experiences of abuse without it rendering you speechless -- not being harsh, but ..