The Online Public Access Catalogue (OPAC) is one the tool to retrieve the information sources. The features of OPAC are having more slant to the requirement of the library function such as acquisition cataloguing circulation, serial control and OPAC random search strategic on resource information retrieval and services. Further the OPAC resource safe of the library and information centres are going to be an electronic media without much services oriented (OPAC) man power further is dominated by the information database manager such process the data for user friendly interaction with OPAC facilities. OPAC is changed the whole panorama of system and its methodologies as a revolution in the library centre, the characteristics features of a computer development which makes then popular one is because of its usage, storage, retrieval, accuracy, consistence and automatic functioning sequence .

The World Wide Web infrastructure has brought a revolutionary change in the organization and presentation of information. The web is a powerful new medium, through which any person or organization can publish messages for consumption or use by anyone who has access through WEBOPAC. The WEBOPAC is an increasingly important resource in many aspects of life like education, employment, government, commerce, health care, recreation, and more. The WEBOPAC is used for receiving information as well as providing information and interacting with society. This technology can be used to provide interactive virtual tour of any information services which has a prevalence of collections of information on any discipline. The present works aims at analysing the concepts of Online Public Access Catalogue (OPAC). The following content of the book have been logically presented and categorised. We believe that the book will be immense value to the readers.

1. Concepts and features OPAC and WEBOPAC
2. Studies on ICT, OPAC and WEBOPAC
3. Needs and practices of OPAC in libraries
4. An analysis of OPAC and WEBOPAC services in libraries
5. Findings and observation about OPAC services
6. A study on web based information sources and services

Dr. S. Dhanavandan, is working as Assistant Librarian at The Gandhigram Rural Institute - Deemed University, Gandhigram - 624 302, Tamil Nadu. He has completed M.A. B.Ed., (Economics) DLL & AL., (Law), M.L.I.S, M.Phil, and Ph.D (LIS) in Annamalai University, Annamalai Nagar. He has guided many Ph.D scholars and Doctoral Committee member in various Universities in Tamil Nadu. He has published more than 55 articles in National and International Journals and 75 papers presented and published in National and International Conferences. Further he also published in Ten books in Library and Information Science and 15 papers published in Chapters in edited books. He has attended more than 40 Seminars/Workshops and training programmes. He served more than 12 years as Senior Librarian in reputed Engineering College. He has organized two workshops on Developing Article Writing Skills and Web Technologies for Employability skills. He is life of member of SALIS, IALA and MALA. Mrs. A. Isabella Mary, Currently doing Ph.D in Library and Information Science in the Gandhigram Rural Institute - Deemed University, Gandhigram - 624 302, Tamil Nadu. She has completed M.C.S., M.L.I.S., M. Phil and PGDCA. She has published few papers in National, International Journals and Conference Proceedings.