INFORMATION RESOURCES AND SELECTION PRINCIPLE: 

The main objective of a library can be stated as" "To provide for the information needs of a given group of users in relation to their given problems with information from given subjects or topics contained in given information sources, evaluated, prepared and supplied in a way that is appropriate to the given groups of users and their political requirements and values." This can serve as a broad guideline for the development and operation of any library. But to fulfill this  role there is a need to organise the library into convenient sections according to a carefully thought out plan. Possibly, the best results would occur if planning is done on a functional basis. 

One of the first functions is what is known as Information Resources Development which includes development of both documentary and non-documentary sources of information. The former is what is known as Collection Development and involves identification, selection and procurement of documents. It is an essential and important activity as it facilitates providing  of an efficient and effective library service.