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Abstract The numerous controversies surrounding African American Vernacular English can be illuminated by data from phonological and phonetic variables. However, what is known about different variables varies greatly, with consonantal variables receiving the most scholarly attention, followed by vowel quality, prosody, and finally voice quality. Variables within each domain are discussed here and what has been learned about their realizations in African American speech is compiled. The degree of variation of each variable within African American speech is also summarized when it is known. Areas for which more work is needed are noted.
Erik R. Thomas (Sat,) studied this question.