Abstract: A computer-implemented knowledge management method enables a user to send a query on one or more specified topics to a selected group of persons. A form is displayed to each recipient, allowing them to respond that they are unable to help or to recommend themselves or one or more other persons as being an expert on one or more of the specified topics. A recipient may also forward the query to another group of people, who can themselves respond. The responses are used to update a searchable database of persons and their areas of expertise. The system thus automatically over time builds up a database defining a tacit knowledge network, based on users' recommendations.