What is the author's style in A Moon for the Misbegotten by Eugene O'Neill?

Eugene O'Neill wrote in a time when there was great change on stage. Using plain English the way that working class people would speak was fairly new in theatre, and O'Neill was one of the playwrights introducing a working-class dialect in their plays.

Josie, Mike and Hogan do not have higher education. They speak simply. Jim, who is wealthier, also speaks plainly. What they also all share is a love of wit and of sarcasm. Harder is of a different sort and as such, has a different vocabulary. He hardly speaks at all in the play- a way for O'Neill to visibly demonstrate that his focus is on the farmers and not the upper class.