People: "Well we could put this data in the address book.....?"

Me: "Wait, what does that data have to do with the address book? Does a given address need that data / is it specific to that address?"

People: "No it's not related to addresses ... we just thought we could put it there."

Me: ....

Me: "So if you use that address you always want that specific data you want stored in the address book?"

People: "Oh no it's not tied to addresses."

Me: ....

Me: "So help me out here, when do you use a given piece of data? In the example here, what made you add that information?"

-Silence-

People: "Um, I'm not sure."

Me: "I think it would be a good idea if we found out. That might provide us some important guidance here."