It takes a systems approach, addressing all aspects of Information Retrieval System. The main difference between this book and the first edition is the addition of text descriptions of automatic indexing of multimedia documents, as items in information retrieval is now regarded as a combination of text along with graphics, audio, image and video data types. With the availability of a large number of multi-media on the Internet (audio, video, pictures), Information Retrieval System needs to address multi-modal retrieval. The text provides coverage of all major aspects of information search and have a detailed enough to allow students to implement a simple Information Retrieval System.