Broad Australian has been described in terms of its realization of the phonemes /i/, /eI/, /aI/, /a /, /o /, and /u/. In the first part of this investigation two groups drawn from the university were used, one consisting of speakers of Educated Australian, the other of speakers of Broad. A spectrographic examination was made of the phonemes listed above, along with the phoneme / I/, in the speech of these two groups. Some of the conclusions that emerged were that /i/ and /u/ are realized as diphthongs in both types of speech (usual ascription: Educated, [i] ; Broad [ ] ); that /eI/ might be represented as [æI] for Educated and [ ε] for Broad (usual ascription: Educated, [eI]; Broad [ I]); that /aI/ in Broad is probably phonetically [ ε] (usual ascription: Educated [aI]; Broad, [ l]); that /au/ follows the usual ascription of [a ] to Educated and [æ ] to Broad; that / I/ is phonetically [ ε] in both types rather than [ I] ; and that /o / is realised as [ ] in Educated and [ ] in Broad (usual ascription: Educated, [o ]; Broad [ ]). In the second part of this investigation spectrograms were made of the same phonemes in the speech of ten Non-Broad and ten Broad speakers in the outside community. In the light of the results obtained, the findings of the first stage were judged to form a reasonable projection for large-scale investigation of Australian speech. However, with two phonemes, viz./a / and /aI/, the clear distinctions established earlier tended to blur.