•Bob says, “activate
 IETM” in order to switch grammars to the
 IETM grammar.
 –speech.interpreter.GlobalInterpreter.interpret()
 –speech.grammar.CentralGrammarHandler.
 – setActiveGrammarHandler(IETMGrammarHandler)
 •Bob says, “next step”
 and the speech system speaks the 1st step to
 him.
 –speech.CentralInterpreter.ActiveInterpreter. interpret()
 –speech.IETMInterpreter.interpret()
 –speech.Synthesis.speakStep()