Published online by Cambridge University Press: 06 February 2009
The Extensions to the IPA for the transcription of disordered speech and voice quality (extIPA) were approved at the 1989 IPA Congress in Kiel (see Duckworth et al. 1990, Ball 1991). A transcription system for disordered speech needs to provide sufficient diversity of symbols and diacritics to account for the majority of observed phonetic variants. Creation of standard new symbols and diacritics for every observed variant is ultimately counterproductive. We submit that the following phenomena have been observed frequently enough and have sufficient diagnostic and therapeutic implications to warrant consideration as new extensions to the IPA. We do not imply, however, that these are the only atypical speech production phenomena that may, in the long run, be worthy of inclusion in a revised extIPA, and we look forward to further suggestions from clinicians and phoneticians.