• Need for a system configuration that is minimally variant to domain changes

  • Exploit higher levels of information in larger acoustic units such
    as syllables, words and phrases

  • Syllable unit is more stable to artifacts such as insertions and deletions of phonetic units

  • Pronunciation variability in speech modeled implicitly through syllable or word units to a much greater degree than phones (example of OUR, AND)

  • Success of the basic syllable system at WS'97