Purpose: This study aims to evaluate the various features and functionality of web-based Online Public Access Catalogue (OPAC) of IIMB-Library in context of competency present generation library catalogues of Library and Information Science Field. Design or Methodology or Approach: Planned to undertake the case study of examining IIMB-Librarys web based OPAC with the help of appraisal checklist and the users acuities. The checklist of B Ramesh Babu and Ann O Briens is the base for this evaluation. And around 100 questionnaires were distributed to lure the users opinions at other side. Findings: The papers revealed that users satisfaction level is Good rather Excellent and highlights many problems such as, lacking of searching knowledge, limited search features, lack of training, poor database index, and non-accessibility of other IIMs OPACs. The users expressed that there is no provision for cancel book reservation from OPAC. Same ways there are upgradable suggestions to improvise. Originality or Value: The paper would be the primary source to emerging library professionals to embark present ICT based catalogue service and also software vendors who wish to improve, design the functionality, inner working layouts their products.