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How to do Estimates (well) in Agile?


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This session was by Tejaswini M, Agile coach,
techniques and best practices of user story estimation & a practical session on How to Write good user stories, Acceptance Criteria and estimating the Stories using different techniques.

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How to do Estimates (well) in Agile?

  1. 1. Greyamp Consulting | 2018 Presenter – Tejaswini M How to estimate better
  2. 2. What do we consider while doing an estimation? While estimating, do we need to know who will be working on that part of the delivery? Who does the estimate? Does it really matter – if you are putting more effort while doing the actual work? Does estimating in hours mean we know what our pace of work should be to ensure completion on time?
  3. 3. Agenda Quick Overview of Estimates Experiencing estimation through activities Different EstimationTechniques
  4. 4. Do we really need estimates in Agile?
  5. 5. Why Estimation? Helps understand the Scope of the Sprint Helps reduce People dependency Delivery Forecasting
  6. 6. What is Estimation?
  7. 7. What are the parameters for estimation? Risk Effort ComplexityFunctionality Current Knowledge
  8. 8. How do we do Estimation? • Ideal Days • Story Points
  9. 9. Ideal Time How long something will take if: • It’s all you work on • No one interrupts you • And everything you need is available Ideally • Monday has 8 hours • Every week has 40 hours But instead Each day we have • 2 hrs of meeting • 1 hr of emails • 1 hr of status reporting • 3 hrs left for the project work only
  10. 10. How Tall are these Buildings? Relative v/s Absolute The Great Pyramid The Eiffel Tower Petronas Towers Burj Khalifa 139.5m 324m 452m 828m
  11. 11. Story Points • Story Points are the unit of measurement for expressing the overall size of a user story, feature, or the piece of work. • The number of story points associated with a story represents the overall size of the story. • Either doubles OR Fibonacci Series • Fibonacci Series [1,2,3,5, and 8] • Doubles [1,2,4, and 8] 1 2 3 5 8 13 20 40 100
  12. 12. Let’s Paint the Story Point
  13. 13. Estimation techniques Agile Relative Sizing Wideband Delphi Affinity Estimation Planning Poker
  14. 14. How Planning Poker Works An iterative approach to estimating Steps: • Each estimator is given a deck of cards, each card has a valid estimate written on it • Customer/product owner reads a story and it’s discussed briefly • Each estimator selects a card that’s his or her estimate • Cards are turned over so all can see them • Discuss difference (especially outliers) • Re-estimate until estimates converge Image source:
  15. 15. Those who do the work, estimate Justify estimates Group Estimate Relative Its quick and fun Everyone’s opinion is heard Save time otherwise spent debating One order of magnitude Constrained with set of values No Pressure to be accurate
  16. 16. Tejaswini Mahadev m-8b861bb6/