This MiddleWeb post from the author of Well Spoken:
Teaching Speaking to All Students emphasizes the importance of normalizing
speaking / listening routines as well as consistent, teacher utilized vocabulary
around speaking skills. One strategy he suggests is giving every student a
Poker Chip to use at some point to add a comment
to the discussion by the end of class. He also suggests mini-lessons targeting specific speaking skills like guestures, poise, voice, etc.