10. The system of claim 9 and assigning newly received documents further comprising: placing a newly received document in a sub-cluster within a selected cluster.
10. The system of claim 9 and assigning newly received documents further comprising: placing a newly received document in a sub-cluster within a selected cluster. 13. The system of claim 10 , wherein each of the obtained association rules includes an associated confidence measure and wherein the selected cluster is based on the confidence measure associated with each of the association rules that match the newly received document.