Directed
Dialog
–Command words and phrase-based
responding
»Voice menus – key
phrases and common synonyms
»Transactions using
number inputs
»Yes/No
»Prompting for
exact phrase
»Grammar designed
for prompted phrases, variations, synonyms, and unprompted options
–Slot-filling
»E.g. ATIS, airline
reservations
»Less constrained
speech
»Pertinent
information (dates, times, locations) captured by grammar design