What technique, support, and effect is used in "Pygmalion"?

I assume
your speaking of Higgins' technique
to teach Eliza Doolittle how to speak "proper"
English.  His technique
includes having her record her speech into the phonograph and repeatedly

listening and practicing.  He made her speak with marbles in her mouth (some of which
she
swallowed in the process).  He does not appear to care much for
the...