Teamwork and group skills.
The "Yes and..." concept.
ETA: I put "Yes and" here, but I'm not entirely sure about it. I can explain the concept and I can see it's value in improv, but I can't think of any specific/concrete skills it assists.
If anyone wants an explanation of Yes And, I can provide one, and then you can evaluate its merits...
I find "Yes and"---in the general sense of affirming and adding---to be preferable to active listening, so it might work as a good conversation tool.
The difference is that while active listening is supposed to be about repeating and reflecting, most people don't get past the repeating part, so it gets annoying. Yes-anding both quickly affirms that you heard what the other person said and provides either a connection to new topic or further insight. This is enough to show that you are listening, and leads to more interesting conversation. This is mainly from observing others converse lately, and it seems the 'yes ander' gets the best response and makes others most comfortable.
Recent brainstorming sessions at SIAI (with participants including Anna, Carl, Jasen, Divia, Will, Amy Willey, and Andrew Critch) have started to produce lists of rationality skills that we could potentially try to teach (at Rationality Boot Camp, at Less Wrong meetups, or similar venues). We've also been trying to break those skills down to the 5-second level (step 2) and come up with ideas for exercises that might teach them (step 3) although we haven't actually composed those exercises yet (step 4, where the actual work takes place).
The bulk of this post will mainly go into the comments, which I'll try to keep to the following format: A top-level comment is a major or minor skill to teach; upvote this comment if you think this skill should get priority in teaching. Sub-level comments describe 5-second subskills that go into this skill, and then third-level comments are ideas for exercises which could potentially train that 5-second skill. If anyone actually went to the work of composing a specific exercise people could run through, that would go to the fourth-level of commenting, I guess. For some major practicable arts with a known standard learning format like "Improv" or "Acting", I'll put the exercise at the top and guesses at which skills it might teach below. (And any plain old replies can go at any level.)
I probably won't be able to get to all of what we brainstormed today, so here's a PNG of the Freemind map that I generated during our session.