Evaluation of library service effectiveness is important in identifying the areas where improvement is most needed, and in justifying library budgets. Traditional methods of service effectiveness evaluation have been too costly and impractical for regular use. However, most of the data required for this evaluation can be collected inexpensively and quickly with automated library systems which many libraries have already started using. This study reviews traditional methods of library service effectiveness and proposes new methods which take advantage of electronic data processing. The proposed methods are practical and inexpensive so that they can be used routinely. / Ph. D.