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# Agile estimating - what's the point(s)?

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A short practical session on agile estimating. In this session we look at: …

A short practical session on agile estimating. In this session we look at:

1. Understand the importance of estimating size and duration separately.
2. Understand how a team can use relative estimating.

This presentation is based on material and activities from Mike Cohn's CSPO course.

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• 1. IBusiness Analyst for 6 years and IIBA NW&E Branch member Joined Sigma in July 2012 Working on Agile projects for the past 4 years Certified Scrum Product Owner
• 2. Understand the importance of estimating size and duration separately. Understand how a team can use relative estimating. Give it a go!
• 3. • How long a user story will take (effort) • Inﬂuenced by complexity, uncertainty, risk, volume of work, etc. • Relative values are what is important: • A login screen is a 2. • A search feature is an 8. • Basic math properties should hold • 5+5 = 10
• 4. Lion Kangaroo Rhinoceros Bear Giraffe Gorilla Hippopotamus Tiger
• 5. • Look for the things you know, that have known estimates or sizes • Use them to help compare tasks to ensure that they are relatively similar in size
• 6. • A little eﬀort helps a lot • A lot of eﬀort only helps a little more
• 7. • Can you distinguish a 1-point story from a 2? • How about a 17 from an 18? • Use a set of numbers that make sense; I like: 1, 2, 3, 5, 8, 13, 20, 40, 100 • Stay mostly in a 1-10 range
• 8. An iterative approach to estimating Steps 1. Each estimator is given a deck of cards, each card has a valid estimate written on it 2. Product owner/Scrum master reads a story and it’s discussed brieﬂy 3. Each estimator selects a card that’s his or her estimate 4. Cards are turned over so all can see them 5. Discuss diﬀerences (especially outliers) 6. Re-estimate until estimates converge
• 9. Round 1 Round 2 Player 1 5 8 Player 2 5 8 Player 3 8 8 Player 4 20 13