The project is done to your specifications. Disadvantages Provisions must be made for the time that the shelflist is with the vendor. Batch Retrospective Conversion Advantages Inexpensive. Many records can be converted in a short time. If data entry is required, your staff controls the quality.
Some vendors lend hardware for data entry.
Disadvantages Your library may have to hire, train, house, and supervise a retrospective conversion staff. Multiple matches and no matches must be resolved. Records may not be full MARC, depending on the database used. Database may not support resource sharing. Your staff controls the project.