You could use these concepts to develop "models" (detection methods) when used on "domains" (types of things they're trying to detect/discern) and judge their accuracy based on those combinations. Players roll 1d20+Irreducible Error+Bias against the DC. DM secretly rolls a Variance die and adds it to their total. If the final total is at or above the DC, you tell them the right answer. If the final total is under the DC, you tell them a wrong answer.
Illusion Magic:
Irreducible error: +3
Tags: deceptive, magic, visual