Thanks! "Getting to Yes," from the (former?) Harvard Negotiation Project is the foundation, which describes how to find principles and create options to discover a deal you can all be happy with. It's of an era, but so was Euclid, so you'd be kind of conceptually helpless without it.

The idea of negotiation as an empirical process of value discovery, not sure, it might be mine, and the process of walking back the premises and then adding principles is a rhetorical device that originates in Socratic dialogue and seems to have been picked up by critical theory types as a dilution/diffusion technique, but covered and observed in a bunch of different places, some of them probably a bit culty. The idea of negotiation as a dialogue is the artifact of the old stuff, whereas I think it has changed, and while useful, you had to accept the assumption that the affairs of the world were decided by dialogue and reason. It was written before Twitter.

Compressing it this way is mine. I've been accumulating notes for an advanced negotiations book for years, maybe it's finally time to write it. :)