Database key
Our company refers to our "products" (books, mostly) by one of three ways. By the author's last name, like "Rosenzweig." By the title, like "Life." Or by the ISBN (which is how I key them in the database.) Sometimes we use a combination, which is helpful when one author has multiple books, or something like that. The problem is, the computer has to be literal about what is uses for the database key, and people don't. So how do I match a request about "the Avise book" to a menu item reading "0418 - Molecular Markers, Natural History, and Evolution, Second Edition"?
Wetware, of course, that fallible link we weren't supposed to be relying on here. I just remember them.