In general, the committee accepts what we used to call "defect reports" (now something like "requests for improvement"), assigns them "WG14 series" sequence numbers, and upon requests for "floor time" schedules meeting discussions. Occasional votes are taken, which might trigger modifications to the draft standard. At some point, the committee decides that the updated draft standard is ready for public review, and the various national representatives deal with review comments. All this starts with proposal documents in "WG14 series" form.