This advice-column-style blog for SLPs was authored by Pam Marshalla from 2006 to 2015, the archives of which can be explored here. Use the extensive keywords list found in the right-hand column (on mobile: at the bottom of the page) to browse specific topics, or use the search feature to locate specific words or phrases throughout the entire blog.
I am not an expert in working with accents, although I have always had a secret desire to specialize in it. My professors called this “Dialect Reduction” but modern therapists call it “Code Switching.”
The continuing ed classes on dialect reduction I have taken in recent years and the old books on elocution that I have read both indicate that dialect reduction is all about working on vowels, diphthongs, a few select consonants, and all the super-segmentals (intonation, stress, emphasis, rhythm, resonance).
The client’s vowels can be all over the place and usually too few in number, the diphthongs can be completely absent, and consonant errors tend to be on the later-developing sounds, especially L, R, Sh, Ch, J, F, and Th. Clusters can be a problem too.
The work is just like any other articulation work –– identify what the problems are and work on those. Traditional one-phoneme-at-a-time work will be adequate. Keep in mind that most of these people will have excellent oral-motor skills so the therapy becomes mostly one of ear training.