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Practical
Story Sizing
Brett Maytom
Senior Consultant, Readify
Vic .NET – 13 Aug 2011
Talk Backlog
What
is size
Relative Size
Sizing Scales
Velocity
Story Size versus Task Sizing
Running Sizing Meetings
Questions
What is size?
Unit
of measure for work
Why Relative Sizing
Your
Time IS NOT My Time
Size does not …
indicate
time
Indicate skill
include risk
change over time
Increase\decrease with proficiency
Relative
It’s relative
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
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”
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
Story Sizing
Uses
a relative sizing scale
Not done at iteration planning
Used for Release Planning
𝐵𝑎𝑐𝑘𝑙𝑜𝑔 𝑆𝑖𝑧𝑒
# 𝑆𝑝𝑟𝑖𝑛𝑡𝑠 =
𝑉𝑎𝑙𝑜𝑐𝑖𝑡𝑦
Stories and Tasks
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
Sizing in multi-team
Consistent
story size critical
Large scope differences
Clear benchmarks
Central team
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
Spikes
Totally
new technology
Never done before
Have no idea how to size work
Time-boxed
to a few days
Acid Test
A story sized in
the first sprint
should have the
same size in
later sprints
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
Thank you
Brett Maytom
[email protected]
@brettmaytom
http://brett.maytom.net