I’ve linked to this on the left, but can’t seem to say it enough…
Donella Meadows’ description of places to intervene in a system is the best guide I’ve come across for this stuff. I don’t necessarily use it as a way to categorize the type or degree of systemic intervention an initiative is taking on but rather as a prompt to help me feel for the where an intervention may be most effective and what shifts may be prompted by the intervention being contemplated.
Watch out though… it gets addictive.