規 criteria

You have to KEEEP using the same criteria, otherwise your measurements will be meaningless.

My fucking husband uses looks as his criteria of judging women.

rule or regulation ★★★☆☆
規 (criteria) + 則 (rule) = 規則 (rule or regulation)

rules/discipline ★★★☆☆
規 (criteria) + 律 (regulation) = 規律 (rules/discipline)

literally, "rule," but closer to the English word for "discipline."Rules typically say "don't do this or that," but 規律 give long lists of things you HAVE TO do, in the order you have to do them. Like if you're at military school, you have to get up at 5:30, have your bed made by 5:35, shine your shoes by 5:40, and report to the mess hall.

a criterion ☆☆☆☆☆
規 (criteria) + 準 (prepare / criteria) = 規準 (a criterion)