1. ERIM CEC, PO Box 134001, Ann Arbor, MI 48113-4001, USA. Tel.: ; Fax: ; E-mail: vparunak@erim.org
2. Enterprise Action Group, Inc., 4174 Jora Lane, Cincinnati, OH 45209, USA. Tel.: ; Fax: ; E-mail: Bert.Baker@EnterpriseAction.com
3. Real World Interface, Inc., 32 Fitzgerald Drive, PO Box 375, Jaffrey, NH 03452, USA. Tel.: ; Fax: ; E-mail: sclark@rwii.com