NDSS'01 -- Network and Distributed System Security Symposium - San Diego, California, 7-9 February 2001. IuK 2001: The 7th Meeting of the Information and Communication Initiative - Trier University, Germany, 11-14 March 2001. ETAPS 2001 -- The European Joint Conferences on Theory and Practice of Software - Genova, Italy, 2 - 6 April, 2001. Managing Complex Organizations in a Comples World - Theme: Leadership in Rapidly Changing, Business Environments - Learning and Adapting in Time. Harvard Square, Cambridge, MA, USA, 31 May - 1 June 2001. CIMA'2001 -- Computational Intelligence: Methods and Applications - Bangor, Wales, UK, 19-22 June 2001. UML 2001 -- Fourth International Conference on the Unified Modeling Language - Modeling Languages, Concepts and Tools'. Toronto, Canada, October 1 - 5, 2001. ICSM2001 -- International Conference on Software Maintenance - Florence, Italy, 6-10 November 2001. WELCOM'01 - Second International Workshop on Electronic Commerce - Heidelberg, Germany, 16-17 November 2001. CIA-2001 -- Fifth International Workshop on Cooperative Information Agents - Modena, Italy, September 6 - 8, 2001.