Dear Keith and Pam,
You are right! Here is the link to what originally aimed me toward the 3-Tier Partnership App:
It covers the way that Structure and Process define the Purpose, Domain and Accountability in relation to partnering, and Community Members are their third kind of partner. From this I went to the more formal Holacracy App, and downloaded it, with the intention of taking into account that schema too, so that, with the appropriate tweeks, I can produce a system which would fit my organisation.