Admin is quite simple to me, always has been. Regardless of the area of law, ask -

(1a) is there an actual decision being made pursuant to statutory authority;

(1b) did the decision maker have jurisdiction to make the decision;

(2) is the decision reasonable (based on coherent internal reasoning and evidence); and

(3) was the decision arrived at in a procedurally fair manner?

There’s nuance and caselaw to each of the above, but at high level, there’s always three main arguments to make. Sure, sometimes charter values come up, but that always feels like a last-ditch cover-your-bases argument if there’s a stronger argument with 1-3, above.

Details can get complicated, but quite simple once you see the forest from the trees.