This is one of those stories that has distorted over time. "Dealer" was a weekly meeting for many purposes, the main one was to provide a vehicle for coordination, planning, communication without having to set up a management structure for brilliant researchers who had some "lone wolves" tendencies.
Part of these meetings were presentations by PARC researchers. However, it was not a gantlet to be run, and it was not to train people to argue in a constructive way (most of the computer researchers at PARC were from ARPA community research centers, and learning how to argue reasonably was already part of that culture).
Visitors from Xerox frequently were horrified by the level of argument and the idea that no personal attacks were allowed had to be explained, along with the idea that the aim was not to win an argument but to illuminate. Almost never did the participants have to be reminded about "Class 1" and "Class 2", etc. The audience was -not- determined to prove the speaker wrong. That is not the way things were done.
Part of these meetings were presentations by PARC researchers. However, it was not a gantlet to be run, and it was not to train people to argue in a constructive way (most of the computer researchers at PARC were from ARPA community research centers, and learning how to argue reasonably was already part of that culture).
Visitors from Xerox frequently were horrified by the level of argument and the idea that no personal attacks were allowed had to be explained, along with the idea that the aim was not to win an argument but to illuminate. Almost never did the participants have to be reminded about "Class 1" and "Class 2", etc. The audience was -not- determined to prove the speaker wrong. That is not the way things were done.