The "values" part of the Manifesto for Agile Software Development 
were finalized at the Snowbird Workshop. The Principles were negotiated via email afterward.
The latter list had been drafted toward the end of the workshop. I was the person who pushed for getting it finished. Because of the requirement for consensus and the lag and low bandwidth of email, the principles had to be basically "take it or leave it," without the possibility of wordsmithing it into something more consistent and less clunkily worded.
I regret that, and wonder if that might have accounted for how the Principles weren't things people would reel off in meetings, like they did for "Individuals and interactions over processes and tools" which, in my experience, was often used to short-circuit discussion of the actual tools programmers need to do their job.