[yummyfajitas]

Making the creator's beliefs (including hidden assumptions) completely clear is valuable all by itself. But in addition to revealing the creator's beliefs it also reveals arithmetic errors, which are quite common in poorly specified verbal models.

For an example of the latter, observe this HN thread: https://news.ycombinator.com/item?id=7042469

[scarmig]

I'm surprised you didn't include a link to this thread, where I still owe you some work...

https://news.ycombinator.com/item?id=6725096

[yummyfajitas]

Yeah, but that's a discussion I didn't want to get into again. A simple, completely indisputable arithmetic error made the point better.