Investigates the extent to which users of Black South African English (BSAE) command the vowel system of English. One mother tongue speaker each of English, Southern Sotho, and Zulu read a set of stimulus words representing various monothong contrasts in standard South African English. Results are discussed in relation to the question of whether BSAE is an interlanguage or a fully-fledged, new English. (Author/VWL)