To facilitate respect for the professional contribution of the Government Printing Office as well as to prevent duplication of effort and maximize the cost effectiveness of the cooperative effort, the basic philosophy of the editing and revision process is acceptance of previous work. Only those changes that are necessary to update the record to LC standards are to be made. If there is any doubt as to whether or not a change should be made --DO NOT MAKE IT!! However, the scope of changes and revision should ensure compatibility with previously cataloged editions of the same work as well as directly analogous works issued by the same body.

See also:

Appendix D. GPO to DLC