This is not my area of expertise ... but .... if Work in FRBR doesn't mean any particular manifestation, expression or item ... what does it mean? Do Works live in Plato's world of Ideas where abstracted version of things exist in a more real and more true sense than any shifty mimes in our world of sensation and change? http://en.wikipedia.org/wiki/Theory_of_Forms Is it a bit like copyright law -- Works (ideas) can't be copyrighted but manifestations, expressions and items can? Or is Work actually an empty container that doesn't really exist -- even in the World of Ideas hovering over the Earth -- until it is filled with at least one (manifestation, expression, item)? And if so, who chose this particular word? Was something wrong with calling it ... Idea? Or even ... Thing? Why work? Work to me in plain English and even librarianese definitely implies a manifested thing, not the idea of thing that transcends any particular and specific expression.