> Optional is useful in a requirements RFC. > > Feature x is REQUIRED > > Feature y is OPTIONAL I think it's clear from the discussion that we do not have consensus on deprecating the adjectives and are not likely to, so I will remove those in the next update. That makes me inclined to remove the whole section and, as John suggests, keep this purely to the issue of capitals... unless there's a real interest in deprecating "SHALL" and "SHALL NOT", as they add nothing to the "MUST"s other than history/custom. Barry