Alexis Soloski blogs on The Guardian's website about Sylvia Plath's "Three Women" and more in " What makes a play unstageable ?" Of course, I'm in the camp that views "Three Women" as a poem based on how Plath refers to it in Letters Home and how typescripts I've seen held in various archives call it "A Poem for Three Voices." Some of these are contemporary to its first radio broadcast in August 1962, too. But, I'm also open to it being produced and termed as a play, given the narrative structure.
Sylvia Plath Info Blog by Peter K. Steinberg. The blog of A celebration, this is.