The protocol has been undergoing revision and review over its entire history.

The party's standard slogan also seems to have undergone revision during the central committee meeting last week.

Security rooms are based on a 1951 civil defense law that has undergone several revisions.

These rules and regulations have undergone several revisions over the years.

It is still undergoing revisions, even though its main provisions appear to be set.

The different models all underwent various revisions and improvements over the years.

Through the years the program has undergone several revisions and updates.

Thus many lawmakers say it is likely to undergo considerable revision.

They could undergo substantial revision before the final report is adopted by the agency this summer.

Smith says Coleman's opinions were final and never underwent revision.