System Attributes
Cover the constraints in terms of the software system rather than the business.
E.g. "Displays data in no more than 2 colors" ==> "Limit GUI color selection to 2 colors".
Associate with requirement/constraint/etc that it fulfils
Assign reference numbers
Categorize & rank by importance
Reference(s): Braude: p.184 Ch. 2 ("Nonfunctional Requirements"), but in the context of a software system rather than a business