8 Observation

1. The auditory method:
   • IPA:
     The union of all phoneme sets of all languages
     Phonetic similarity between phoneme sets
     
   • SAMPA
     7-bit biunique ASCII-encoding of IPA
     simplification of automatic machine processing,
     consistency checking, etc.
     simplification of email exchange

2. Observation: the physical method
   • Presupposes interpretative and observational pre-selection
   • Extension of observational method by theoretically grounded measuring devices