Just several links regarding taxonomies http://www.lighthouseseminars.com/springslides/DavidSmith-HAL%20Taxonomy.ppt http://www.lighthouseseminars.com/springslides/JosephBusch-Categorization%20and%20Taxonomy%20Strategies%20How%20to%20Find%20and%20Re-use%20Existing%20Schemes.ppt http://www.lighthouseseminars.com/springslides/JayneDutra-NASA%20Taxonomy.ppt Dmitry