Much has happened since the last edition of this benchmark text was published. Today's LIS professionals are experiencing both excitement and trepidation as sweeping societal, technological, political, and economic changes affect our users and institutions and transform our discipline. We are increasingly part of a sophisticated infrastructure: the boundaries of knowledge creation, acquisition, organization, dissemination, use, and evaluation are rapidly blurring, creating new challenges. Similarly, we are also part of a changing environment: an aging population, a ubiquitous and evolving...