A haiku is a short unrhymed poem with a structure of 3 lines. It has 5 syllables in the first line, 7 in the second and 5 again in the last line.
Poems can be rhymed or free verse. Its all up to you and your collborators.
ABA sonatta form or just go nuts.
A Surrealist technique for exploiting the mystique of accident. Ex Corpse is a collage of words collectively assembled. Each collaborator adds to the composition in sequence by only being allowed to see the preceding scribe. The non linear story or Exquisite Corpse only unlocks in its entirety upon completion.
Flash fiction is fiction of extreme brevity. Flash-fiction work contains the classic story elements: protagonist, conflict, obstacles or complications, and resolution. However, unlike the case with a traditional short story, the limited word length often forces some of these elements to remain unwritten, that is, hinted at or implied in the written storyline. This principle, taken to the extreme, is illustrated in a six-word flash penned by Ernest Hemingway: "For sale: baby shoes, never worn." Flash fiction has roots going back to Aesop's Fables, and practitioners have included Boleslaw Prus,Anton Chekhov, O. Henry, Franz Kafka, H.P.Lovecraft, Arthur C. Clarke, Ray Bradbury, Kurt Vonnegut, Jr., Fredric Brown and Lydia Davis.
A short story was defined by Edgar Allen Poe in his essay The Philosophy of Composition as a story that can be read in one sitting.
A novella is a work of fiction somewhere between a short story and a novel in length.