Once access patterns have been discovered, analysts need the appropriate tools and techniques to understand, visualize, and interpret these patterns. Examples of such tools include the WebViz system [PB94] for visualizing path traversal patterns. Others have proposed using OLAP techniques such as data cubes for the purpose of simplifying the analysis of usage statistics from server access logs [Dyr97]. The WEBMINER system [MJHS96] proposes an SQL-like query mechanism for querying the discovered knowledge (in the form of association rules and sequential patterns). These techniques and others are further discussed in the subsequent sections.