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Everything’s Relative
(the brain science behind why we are so much
better at relative rather than absolute estimation)
Stu...
Why Estimate?
Why Estimate?
We want to create predictability
Why Relative Size?
How much does
a Hippo Weigh?
How much does
a Hippo Weigh?
How much does
a Hippo Weigh?
M: 1500 – 1800kg
F: 1300 – 1500kg
If a Hippo is a “3", how
much is a Rhino?
If a Hippo is a “3”, how much is a Rhino?
If a Hippo is a “3”, how much is a Rhino?
White Rhino: 1600 – 2400kg
Male: 1500 – 1800kg
Female: 1300 – 1500kg
What Just
Happened
Inside Your
Brain?
How much does
a Hippo Weigh?
If a Hippo is a “3", how much is a Rhino?
An even simpler way to illustrate this…
size might not matter but
VELOCITY
does
Stuart Mann / @StuartDMann / @runningmann100
Distance2. What is the distance from
your home to the office?
Duration 1 Duration 2
3. How long did each trip
take (in min...
30km2. What is the distance from
your home to the office?
60 minutes 75 minutes
3. How long did each trip
take (in minutes...
Thank You
Stuart Mann / @StuartDMann / @runningmann100
Give a man a fish, and you feed him for a day. Teach
a man to fish,...
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Everything's Relative - The Brain Science Behind Why We Are So Much Better at Relative Rather Than Absolute Estimation

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Stuart Mann: Regional Scrum Gathering South Africa 2019 Presentation - Cape Town

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Everything's Relative - The Brain Science Behind Why We Are So Much Better at Relative Rather Than Absolute Estimation

  1. 1. Everything’s Relative (the brain science behind why we are so much better at relative rather than absolute estimation) Stuart Mann / @StuartDMann / @runningmann100
  2. 2. Why Estimate?
  3. 3. Why Estimate? We want to create predictability
  4. 4. Why Relative Size?
  5. 5. How much does a Hippo Weigh?
  6. 6. How much does a Hippo Weigh?
  7. 7. How much does a Hippo Weigh? M: 1500 – 1800kg F: 1300 – 1500kg
  8. 8. If a Hippo is a “3", how much is a Rhino?
  9. 9. If a Hippo is a “3”, how much is a Rhino?
  10. 10. If a Hippo is a “3”, how much is a Rhino? White Rhino: 1600 – 2400kg Male: 1500 – 1800kg Female: 1300 – 1500kg
  11. 11. What Just Happened Inside Your Brain?
  12. 12. How much does a Hippo Weigh?
  13. 13. If a Hippo is a “3", how much is a Rhino?
  14. 14. An even simpler way to illustrate this…
  15. 15. size might not matter but VELOCITY does Stuart Mann / @StuartDMann / @runningmann100
  16. 16. Distance2. What is the distance from your home to the office? Duration 1 Duration 2 3. How long did each trip take (in minutes)? Actual Speed 1 Actual Speed 2 4. Calculate your actual velocity as follows: distance / time * 60 Speed 1 Speed 2 1. Estimate your average speed to & from the office.
  17. 17. 30km2. What is the distance from your home to the office? 60 minutes 75 minutes 3. How long did each trip take (in minutes)? 30km/h 24km/h 4. Calculate your actual velocity as follows: distance / time * 60 50km/h 40km/h 1. Estimate your average speed to & from the office.
  18. 18. Thank You Stuart Mann / @StuartDMann / @runningmann100 Give a man a fish, and you feed him for a day. Teach a man to fish, and you feed him for a lifetime. Give a Mann a drink voucher and you’ll quench his thirst for an hour. Keep buying a Mann beer and you’ll never get him to shut up.

Stuart Mann: Regional Scrum Gathering South Africa 2019 Presentation - Cape Town

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