I generally agree. I can conceive of a point, however, where some people could be overwhelmed by the sheer volume of N/As. I work in a heavy project (technical sense, not GTD sense) environment, and I've had hundreds of N/As on my list at some times. A couple of those times I've had to cull through and pare the list back just to avoid that overwhelmed feeling. But, punch line, I still vote >1 N/A per project is fine. FWIW.