Levels of Analysis for NLU
(Read up from the acoustic level to the pragmatic level)
Pragmatic level (goals, intents, dialog, rhetorical structure, speech acts)
Semantic level (meaning, representation)
Syntactic level (grammar, phrase structure)
Lexical, Morphological level (words, inflections)
Phonological level (acoustic features -- phonemes)
Acoustic level (sensing, signal processing)