The University of Crete Library started the input of bibliographic data in an automated system at 1989. When the Initial Programme for Education and Vocational Training started at 1997, a plan has been developed for Retrospective Cataloguing and much effort has been put on this project. The length of the Library's collection and its importance make it one of the most important collections in our country, thus there was a need for a careful and well organized approach and methodology for its treatment. Today this catalogue includes the 98% of the bibliographic data which exist in the Library and it consists one of the most comprehensive catalogues in Greece. Through this paper the author presents the plan that has been developed by University of Crete, the existed problems and difficultiies, the problems which were caused by the lack of standardization for greek books and the need to form a team for the cooperation of Academic and Public Libraries.