[btilly]

You can boil it down a lot more than that. And not necessarily to such noble criteria.

http://www.jwz.org/doc/groupware.html famously boils it down to one question: Your "use case" should be, there's a 22 year old college student living in the dorms. How will this software get him laid?

[flipside]

Hypothetically speaking, the odds of getting laid after seeing a movie with a date probably go up if both people liked the movie.

Not exactly how we'd track it but the number of people that get laid after using our system would be a fascinating statistic.