The Importance of Time-boxing
When using Scrum, your iterations are fixed time (1 week, 2 weeks, 30 days etc) and therefore your cost is fixed so the only thing that can vary is scope.
Tag: Daily Scrum Tip
Truthfulness is the key
This extends to any type of business or co-worker relationship, but Scrum teaches truthfulness above all else. The Team must trust each other and be honest with themselves and other