Clayton 
Derek 
Roy 
Clayton Lengel-Zigich, Derek Neighbors, Drew LeSueur and Roy van de Water discuss story sizes, naming your sprints and partial credit:
- 20, 40, 100 story point sizes
- Less accurate as they get bigger
- Naming your sprints
- Rally point for deliverables
- Historical data
- Sprint goals
- Partial credit for points
- Does story size matter
- Symptom of a deeper problem
- Too focused on velocity
- Paycheck advances
- The defect board as a debt collector