The purpose of this manual is to specify the additional steps required in the data collection process to prepare bibliographic data for conversion into machine-readable form. It is designed to aid catalogers in preparing catalog entries in machine readable form for the on-line cataloging system of the Ohio College Library Center. The rules for data preparation for compatibility with an on-line system are presented, and are based upon "Data Preparation Manual: MARC Editors" (MARC Manual, Vol 2). (SJ)