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Selected technologies that contribute to knowledge management solutions are reviewed using Nonaka's model of organizational knowledge creation as a framework. The extent to which knowledge transformation within and between tacit and explicit forms can be supported by the technologies is discussed, and some likely future trends are identified. It is found that the strongest contribution to current solutions is made by technologies that deal largely with explicit knowledge, such as search and classification. Contributions to the formation and communication of tacit knowledge, and support for making it explicit, are currently weaker, although some encouraging developments are highlighted, such as the use of text-based chat, expertise location, and unrestricted bulletin boards. Through surveying some of the technologies used for knowledge management, this paper serves as an introduction to the subject for those papers in this issue that discuss technology.