While I was working on the first movement of a sonata with a student yesterday, she noticed that the development section had a snippet of this and a snippet of that. Nothing stayed in its place very long. It made perfect sense for her because she copes with attention deficit disorder. She called it the ADD section.
I laughed out loud.
In a Sonata Form exposition we have an A theme, a B theme (transition), a C theme (second theme), and a D theme (closing). Then we have the ADD section, which is usually followed by A, B, C, and D presenting themselves in order once again.