This video from CollabNet provides a great insight into how a model backlog refinement meeting should be run (and how it shouldn’t…).
Importantly, although not the primary aim, the video also demonstrates Agile collaboration and negotiation done right.
This is exactly the right attitude towards Agile development:
Originally sourced from http://scrummethodology.com/scrum-effort-estimation-and-story-points/
Setchu - Agile at Scale 