OPACS ● Features An extension of marc records A product of library automation A bibliographic database/ of library resources for an institution at various levels, e. g, local, regional national IR capability Easy to browse(resemble shelf structure) Based on well-established hierarchical database structure May provide sophisticated searching capabilities but users may not benefit from them7 OPACs Features ¨ An extension of MARC records ¨ A product of library automation ¨ A bibliographic database of library resources for an institution at various levels, e.g, local, regional, national IR capability ¨ Easy to browse (resemble shelf structure) ¨ Based on well-established hierarchical database structure ¨ May provide sophisticated searching capabilities but users may not benefit from them