This article explores the challenge given by dramatic changes in the Internet and information environment both to library and information science and to documentation and information workers, and reviews the course of development  of information science and its relations with library science. And  then the author expresses his opinions over the  disputes around what is the best name for library and information science as a branch of learning; in relation to this, the  author airs his ideas on a “cross- disciplinary”  phenomenon and  “out- of- bounds”  phenomenon in academic research. The article analyzes finally the process of changes from  “Knowledge is power”  to “information is power”  and then to  “Sharing knowledge is power” and its significance, and appeals for strengthening the knowledge management studies from documentation and information professionals .