Agile%20Estimating%20

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Agile Estimating Planning

• Kane Mar
• Certified Scrum Coach and Trainer.
• http//KaneMar.com
• http//Scrumology.com.au

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Others (see credits)

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Agenda

• About me.
• Traditional Estimating vs Agile Estimating
• Relative Estimates
• Context is Important
• Deriving Project Duration

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About Me.
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Tradition Estimating vs Agile Estimating
KLoC
Ideal Days
Function Points
Story Points
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Relative Estimates

• Agile estimates are estimates made on a relative
  scale
• Heres an example Smarties in a glass

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Relative Estimates

• Points are abstract representations of size,
  which includes complexity, effort etc.
• Scales currently used
• Fibonacci Scale 1, 2, 3, 5, 8, 13 ...
• Linear Scales 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
• T-shirt sizes XS, S, M, L, XL

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Relatives Estimates

• Points do not have units
• Points are not related (easily) to hours or days
• What use are relative estimates if we dont have
  a time or duration associated with them?
• How can we use an abstract concept to derive
  durations and timeframes?

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Exercise Relative Estimates

• We use an abstract concept to enable transactions
  for goods and services every single day.
• We define the value of a dollar (fiat money) by
  how much stuff we can buy with it

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Exercise Relative Estimates

• 1 litre of milk

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Exercise Relative Estimates

• A loaf of bread

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Exercise Relative Estimates

• A dozen eggs

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Exercise Relative Estimates

• A desert

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Exercise Relative Estimates

• This is a Runeberg Tart. Its named after the
  Finnish national poet Johan Ludvig Runeberg (1804
  - 1877) who, according to the legend, enjoyed the
  tart with punch

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Context is important

• Context is important when estimating with
  relative sizing
• The relevance of a Point is very, very local
• Comparing points between teams has very little
  meaning (although it is possible with additional
  effort)

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Exercise Doggie Points

• Labrador retriever
• Chihuahua
• Great Dane
• German Shepherd
• Poodle
• St. Bernard
• Bulldog

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Relative Estimates

• Estimating with Points is fast
• Points can be easy to explain and communicated
• They allow us to deal with ambiguity
• The whole team is involved with estimation

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Project duration from Points
Iteration 3
Iteration 1
10 Pts
9 Pts
Iteration 2
11 Pts
30 Pts
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References

• Agile Estimating and Planning, Mike Cohn
• User Stories Applied, Mike Cohn

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References

• Agile Software Development with Scrum, Ken
  Schwaber and Mike Beedle, 2001
• Agile Project Management with Scrum, Ken
  Schwaber
• Scrum and the Enterprise, Ken Schwaber
• Scrum in 5 minutes, Softhouse Nordic AB
  http//www.softhouse.se/Uploades/Scrum_eng_webb.
  pdf

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Credits
http//www.flickr.com/photos/lfl/
http//www.flickr.com/photos/rugby_pioneers/
http//www.flickr.com/photos/rugby_pioneers/
http//www.flickr.com/photos/66164549_at_N00/
http//www.flickr.com/photos/sierravalleygirl/
http//www.flicker.com/photos/vernhart/
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Credits
http//www.flickr.com/photos/rugby_pioneers/
http//www.ScrumWorksPro.com/
http//www.flickr.com/photos/rbh/
http//www.ScrumWorksPro.com/
http//www.flickr.com/photos/mattimattila/
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This Presentation

• http//KaneMar.com/downloads
• This presentation can be used for commercial
  purposes provide that the license and attribution
  information is retained.