Architecture is kind of a separate job that only some buildings have in addition to and before the actual construction can begin. First a dwarf completes an architect job on a building, and then a dwarf with the required job (such as masonry) completes it. I haven't seen architect on a workshop. I have seen it used for roads and the trading post and I think the bridge uses architect.
[ August 07, 2007: Message edited by: Aaaamory ]