MarcEdit was initially conceived in the summer of 2000, and finished largely in response to a major database clean-up project that had been planned for the Oregon State University’s electronic catalog. The problem was simple; a large number of Marcive records were entering the database with invalid call numbers. The problem had been discovered over the summer, and our initial response was to correct our Marcive profile. The problem, however, was that no one knew how many incorrect records had made it into our system. So we began pulling together list of data in an effort to see how much work needed to be done. The results were staggering--45,000 records needed to be corrected in the database. These records were mainly from series in which we had classed documents materials into LC, rather then using the SuDoc numbers contained in the Marcive records.