The new TTCN-3 extension “Object-oriented features” introduces the concepts “classes”, “objects” and “exception handling” into the TTCN-3 language. Even though some of these concepts have been implemented implicitly in the TTCN-3, the concepts are now integrated explicitly into the language allowing a new style of test specification that provides new ways of designing abstract data types, in the form of user defined classes, and integrating external data by means of external classes. This presentation informs TTCN-3 users, test engineers and test managers about the newest developments of the language.