1. Metafunction
   1. experiential
      1. Process
      2. Participant
      3. Circumstance
   2. interpersonal
      1. Subject
      2. Predicate
   3. textual
      1. Theme/Rheme
      2. Given/New
   4. logical
2. Rank
   1. clause
   2. group/phrase
   3. word
   4. morpheme
3. Axis
   1. paradigmatic
      1. grammatical system
      2. lexical set
   2. syntagmatic
      1. collocation
      2. colligation
4. Stratification
   1. context
      1. field
      2. tenor
      3. mode
   2. semantics
   3. lexicogrammar
      1. grammar
      2. lexis
   4. phonology
   5. phonetics
      1. articulation
      2. prosody