This book covers the user interface issues that involve voice and text user interface, connectivity to the network, including wireless technologies; problems such as mobile agent platform architecture, system of peer-to-peer, and N-Tier client-server architecture mobile, synchronization and replication , in-depth discussion on issues related to advanced XML such as RDF; requirements gathering process, and others. Most importantly, this text does this by extending the proven tools and methodologies today, especially methodology built around UML and UML.