Information services are needed to provide information not only on demand but also in anticipation of its use. Often it will be necessary to repackage the information contents collected from various sources to suit the requirements of specific group of users. Further, there might also be a need to translate a document from one language into another to make the content intelligible to users who are not familiar with the language of the original document. Finally, it would also be necessary to provide users with the complete texts of the documents. Section 3.4 describes users' information needs and their information seeking behaviour and also the methods of assessing their needs and analysing the behaviour. Before we discuss the various services, it is necessary to point out that it is not the library alone which provides information services. It is one of the important links in' the information transmission chain - the chain that links the sources of information to the ultimate users. There are other links also in the chain which along with libraries Constitute the family of information providers. Authors, publishers, librarians, information specialists and users libraries. The next section briefly discusses the roles of such links.