Here, the programmer decides that ``horsepower’’ is really a property of an Engine, not a Vehicle, and indicates the Move Field refactoring.
	I haven’t committed to a UI modality for this kind of interaction; a conventional WIMP technique like drag-and-drop would work, although I’d also like to explore gestural or multimodal techniques, keeping with the metaphor of interacting with a pen-and-paper diagram.
	(Of course this brings up all the complexities of recognition-based user interfaces.)
	Dr Jones records this intention and …