practical story sizing brett maytom senior consultant, readify vic.net – 13 aug 2011
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Practical Story SizingBrett MaytomSenior Consultant, Readify
Vic .NET – 13 Aug 2011
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Talk Backlog What is size Relative Size Sizing Scales Velocity Story Size versus Task Sizing Running Sizing Meetings Questions
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What is size? Unit of measure for work
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Why Relative Sizing Your Time IS NOT My Time
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Size does not … indicate time Indicate skill include risk change over time Increase\decrease with proficiency
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Relative
Equal
HalfDouble
Four Times
Three Times
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It’s relative
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Sizing Scales Fibonacci
1 2 3 5 8 13 21 34 Modified Fibonacci
1 2 3 5 8 13 20 50 100 Binary
1 2 4 8 16 32 64 128 T-Shirt
S M L XL
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Other Symbols 0 (Zero)
“Too small and not worth sizing” ?
“I have no idea what you are talking about” ∞ (Infinity)
“This is way too big”
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Velocity Rate of work of team
“Team can complete X story points per sprint” Not individual Full team
including BA, QA, Dev., Test, Architect, Scrum Master
Improves with time
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Story Sizing Uses a relative sizing scale Not done at iteration planning Used for Release Planning
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Stories and Tasks
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Task Sizing Tasks defined in sprint planning Sized in hours Updated daily with remaining hours Used for sprint burndown Cross-check against Story Size using
current velocity
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Sizing in multi-team Consistent story size critical Large scope differences Clear benchmarks Central team
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How to play Planning Poker Product owner presents a story
Team clarify by asking questions “1 … 2 … 3 … show” Smallest and largest values explain Repeat until consensus reached
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Spikes Totally new technology Never done before Have no idea how to size work
Time-boxed to a few days
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Acid Test
A story sized in the first sprint should have the same size in later sprints
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Practical Tips Use relative sizes for stories Do not factor in effort, risk and time Build a list of benchmark stories Continually inspect that “time” is not
introduced story Differentiate between Task and Story
sizes Your Time IS NOT My Time
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