UML => Class diagram
This diagram basically define the relationships among system, sub systems and actors. So it define the number of action the actor (system also can be a actor) may have.
Case diagram
Asp.net, Ado.net, .Net Remoting, .Net
Webservice, SQL, XML, XSLT, WCF, WPF, WWF NHibernate, Ajax, Jquery, DHTML