Objective of a library is giving the required information and making them available to all the users in the fitting time. It seeks affording and organizing balanced sets of books and other information sources to go together with requirements of users and presenting them the researchers using the both traditional and modern electronic methods.Assessments of outcome may specify to what extent user requirements are met, quality of library services and collection, benefits or effectiveness of expenses incurred and whether library is achieving its assignment or ultimate goal. It is a difficult and expensive task to conduct the assessment and find out the outcome.Libraries may not pursue outcome assessment in the event administrators of libraries do not request such information. How can you assess the measures executed by the library ? What is its impact on users as well as learning process and research? There is no criterion in order to make assessment and compilation of data to facilitate to realize the performance.
Modern society is in constant need of information. Library serves as the entity accountable for the collecting, processing, managing and disseminating of this information in order to meet the changing requirements.It is equally important how libraries are changing and why these changes happening are not covered by the performance measures of traditional libraries. As an example why libraries are using different data in accordance with the size of the library. Background data and interpretative techniques are required in order to classify why libraries are changing and that type of tools are not available at present. Different institutional goals and local library policies are confusing the tasks of interpreting and comparing data. Dissimilarities in institutional mission affect library and commitment of library for collection of data and analysis. Clamouring for some vision of what is happening even though confronted with obstacles, the tendency is to collect existing data to disclose trends and subsequently to interpret the data carefully as they may be confusing. In the event these intricate issues are solved conventional library measures would still gives an imperfect scenario of the information as they focus strictly on information services offered by libraries taking no notice services provided by other entities. Library science in reality needs to examine activities far way from the library as well as activity and its effect within the library. In library operations the absence of standard explanations and measures for gathering and interpreting information that would enable to explain shifting patterns and usage is unfavourably affecting strategic planning and the cases that library management must make to win support for the library and its changing directions.