Abstract: There is provided a method of controlling the flow of information in a client/server system for interactive configuration, wherein a request to a rule base is processed, comprising the steps of: providing request information, resulting from a first client interaction; transferring said request information to the server; collecting intermediate information, resulting from at least one second client interaction succeeding said first client interaction; creating response information on the server responsive to said request information; transferring said response information to the client; determining whether said response information indicates conformity with said rule base; creating merged information responsive to said intermediate information and said response information; determining whether said intermediate information represents a higher level of knowledge than said response information; selecting at least one of the following actions according to said determinations: use said merged information to update