The elements you select to be included in any given composition assignment, and out of which the work will be composed. These might include objects, sounds, physical actions, text, theatrical conventions, etc. The right kind of Exquisite Pressure is created by how many ingredients you assign to be included in the piece and how difficult they are to find, make or include.
The Viewpoints Book, Anne Bogart + Tina Landau
Here are some of the ingredients I put into my first novel, The Fallback Plan: