discovering story points
DESCRIPTION
TRANSCRIPT
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Discovering story points
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@nadiazemskova
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Estimates take time
…and they are never precise
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Why estimate?
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First there were hours
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Hours are dependent on individual
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Hours are dependent on specialty
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Hours are translated into duration
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Brook’s law
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Wishful thinking
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People are bad at estimating time
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People are good at comparison
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Compare these buildings
1 2
5
3
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User story
2 1
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Story point
Complexity
Uncertainty
Effort
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Planning poker
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0
5
10
15
20
25
1 2 3 4 5 6 7 8
Velocity
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3 x 15 = 45 points
Will have
Might have
Won’t have
3 x 20 = 60 points
Time-based planning
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0
40
80
120
160
200
0 1 2 3 4 5 6 7 8
Scope based planning
Finish here with our best
velocity
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1. How many hours are in a story point?
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It’s a distribution
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2. How to estimate cost?
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It’s a range
6 . . 8
. .
x =
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3. Whose points are bigger
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Only for the same team
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Beware of inflation
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Establish common baseline
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4. How to calibrate team changes
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0
10
20
30
1 2 3 4 5 6 7 8 9
Change of velocity
Team member added
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5. How to manage the inflow
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0
40
80
120
160
0 1 2 3 4 5 6 7 8
Burnup chart
Done
Scope
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6. How do you get started?
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This is a “2”
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7. Why are we back to hours?
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These are different units
These are different kind of estimates
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8. What do you burn during sprint
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Hours
Task count
Points
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9. What if you don’t have a team?
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… plan an imaginary sprint
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10. What if you have different skills?
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… velocity will help
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… or different teams
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Estimate effort, derive duration