webrunner said:
Here's something to ponder:
It's called Streetwise but it's based on Cha. Wouldnt that make it Streetcharismatic?
I'm with this guy.
Seriously, I think Streetwise is the "black sheep" knowledge skill; it's not a knowledge skill explicitly, but it behaves like one. In this way, it's the urban analog to Nature and Dungeoneering.
For example, if I'm looking for food in a wilderness environment, I make a DC 15 Nature check to find enough to feed one person. In a completely foreign or alien city, I could make a DC 15 Streetwise check to determine the same thing, even if I can't read the signs, communicate with the locals, and don't know my way around. (Obviously, in more familiar urban environments, I shouldn't need to bother.) Similarly, while I'm spelunking, I can use Dungeoneering to determine which cave slimes are friendly and which ones aren't. By the same token, I use Streetwise to determine which local folks aren't to be dicked with.
I realize my examples above aren't all skill uses specified in the book, but they seem reasonable and appropriate.
Lastly, I disagree that Streetwise belongs as a part of Diplomacy (or vice versa). Diplomacy is inherently a social skill, whereas, as per a few of my above examples, Streetwise doesn't necessarily have to be.
...Which could mean that, sometimes, webrunner is right: Streetwise should use Wisdom instead of Charisma. (But only sometimes.)