Plays with interesting/good structure

Hello all. My sister is taking her first theatre course in college and has to write a paper analyzing the structure of a play of her choice. She asked me if I had any suggestions, so I tried to think of examples with interesting structures off the top of my head (came up with: Betrayal (goes backwards), Miracle Worker (flashbacks), Chorus Line (inside-the-characters-head moments), Angels in America).

Anyway, thought I would post here to get some suggestions from all of you. Thanks so much!

(Sole instructions for the paper: analyze the structure of a play of your choice.)

The Rimers of Eldritch

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"Stop Kiss" by Diana Son.

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'Merrily We Roll Along' by Sondheim and Furth

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There's also "Once in a Lifetime" by Kaufman and Hart, which Merrily we Roll Along is based on (it also goes backwards).

Also:

-- Copenhagen by Frayn (repeats a key meeting several times from several different perspectives).
-- Arcadia by Tom Stoppard (tells two stories with two sets of characters 200 years apart in the same room)
-- Invention of Love by Stoppard (a sort of memory play where poet A.E. Housman tells the story of his life in a series of flashbacks)
-- How I Learned to Drive by Paula Vogel (presents the lead character, a victim of abuse, at multiple points in her life, from childhood to her 30s, nonchronologically -- really a remarkable piece of construction)
-- Well by Lisa Kron (a meta-constructed memory play with flashbacks, characters commenting on how honest the narrator is at telling the flashbacks to the audience, and the "actors" themselves seemingly stepping in and out of character commenting on the play and the playwright -- leaving the play entirely at one point. Absolutely brilliant).

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I was going to suggest A NUMBER by Caryl Churchill. Nothing with time, but it's still interesting.

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Which is also why I suggested "Once in a Lifetime' (which is readily available) rather than "Merrily."

And for Churchill, I'd suggest "Cloud Nine" -- simply comparing Act I vs. Act II would make for an interesting essay.

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Lonely Planet. Two character play that alternates between soliloquies and interacting with each other.

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Also, The Baltimore Waltz by Paula Vogel.

The Sondheim-Furth musical "Merrily We Roll Along" is based on the Kaufman and Hart play, "Merrily We Roll Along".

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If you're willing to dip into the classics, you might want to look at Shakespeare's MACBETH -- his shortest tragedy has a very unique and effective groundwork that makes it such a thrilling play. Shakespeare's Green World comedies are also tightly structured because they all have certain expectations that must be satisfied.

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"Rise and Fall Of Little Voice"
"A Hatful Of Rain"

Thank you all for your help and insight. She very much liked the idea of The Laramie Project (as it deals with something she has heard of before. I also suggested Sunday in the Park with George, but I think she wants to stay away from musicals).

Again, thank you!