Agile estimation 2_Мел Росс
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Agile estimation 2_Мел Росс

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Agile estimation 2_Мел Росс Agile estimation 2_Мел Росс Presentation Transcript

  • Agile Estimation Part II Mel Rosso-Llopart Carnegie Mellon University Rosso-Llopart ©2013 1
  • The estimation Game for Agile    Presented by Mike Cohn in the book “Agile Estimation” The process Delphi process is modified to constrain the number of choices for each estimate Instead of allowing an infinite number of choices a integer set of relative values is used to evaluate the relative size of an item Rosso-Llopart ©2013 2
  • The estimation Game for Agile - 2    The sequence of choices people can use come from the Fibonacci sequence 1, 2, 3, 5, 8, 13, 21, 34, 55, 100* You select a relative value from the sequence to represent your best value for the estimate You cannot choose 2.5, or 5.3, you must choose 2 or 3 and 5 or 8 relatively Rosso-Llopart ©2013 3
  • The estimation Game for Agile - 3  The values can represent size, days, or whatever you are currently estimating in. – You can multiply if you wanted Kilograms versus Grams   All that the “Game” does is it makes you say whether something is relatively greater or lesser than another item. Then when you get actual values you can give a value to your estimate. Rosso-Llopart ©2013 4
  • Exercise for Agile estimation game     We will rank a number of items by relative comparisons using the sequence I will give you one actual value for the sequence We will see if you can properly sort the items based on your estimates. If you can sort them, then you can properly estimate them given some actual values. Rosso-Llopart ©2013 5
  • Planning Poker Estimation technique that values the conversation that occurs during the estimation process Variant of wideband delphi Distributed team members: planningpoker.com (http://agilereckoning.com/ if poker is blocked) For Pivotal tracker: http://poker.stackbuilders.com/ There are other sites that can be used Rosso-Llopart ©2013 6
  • Rosso-Llopart ©2013 7
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  • Exercise 2  Let’s use the new rules Rosso-Llopart ©2013 9
  • Exercise – Individually (No talking)  Rank by Official weight the following items − − − − − − − a) Basket Ball b) Golf ball c) American Baseball d) Tennis ball e) Cricket Ball f) Soccer Ball – Official weight is: 410- 450 grams 14-16 ounces g) Billiard Ball Rosso-Llopart ©2013 10
  • Exercise – As a team   Same rules as general Wideband Delphi, but you can only use Planning Poker numbers. Rank by Official weight the following items − − − − − − − a) Basket Ball b) Golf ball c) American Baseball d) Tennis ball e) Cricket Ball f) Soccer Ball – Official weight is: 410- 450 grams 14-16 ounces g) Billiard Ball Rosso-Llopart ©2013 11
  • Exercise 3  Planning poker again Rosso-Llopart ©2013 12
  • Exercise – Individually (No talking) •Rank by Distance from New York, NY to the these cities: _ _ _ _ _ _ _ a) Singapore b) Tehran c) Moscow – Distance in Kilometers is: 7511 KM d) Sydney e) Washington DC f) Sao Paulo, Brazil g) Honolulu, Hawaii Rosso-Llopart ©2013 13
  • Exercise – As a team Same rules as general Wideband Delphi, but you can only use Planning poker numbers. • Rank the cities by Distance from New York, NY: _ _ _ _ _ _ _ a) Singapore b) Tehran c) Moscow – Distance in Kilometers is: 7511 KM d) Sydney e) Washington DC f) Sao Paulo, Brazil g) Honolulu, Hawaii Rosso-Llopart ©2013 14
  • Exercise – As a team Same rules as general Wideband Delphi, but you can only use Planning poker numbers. • Rank the cities by Distance from New York, NY: _ _ _ _ _ _ _ a) Singapore b) Tehran c) Moscow – Distance in Kilometers is: 7511 KM d) Sydney e) Washington DC f) Sao Paulo, Brazil g) Honolulu, Hawaii Rosso-Llopart ©2013 15
  • Answers are: Rosso-Llopart ©2013 16
  • Discussion time    Was there a difference between the methods?  Wide band Delphi VS “Planning poker” Which one might you use more easily? Will you use Wideband Delphi, either the original or the Agile game the next time you have to make an estimate? − Why or why not? Rosso-Llopart ©2013 17
  • Questions Rosso-Llopart ©2013 18
  • References    Mike Cohn, “Agile Estimation and Planning”, Prentice Hall, 2006. Watts Humphrey, “Introduction to the Personal Software Process”, Addison-Wesley, 1997. Steve McConnell, “Software Estimation Demystifying the Black Art”, Microsoft press, 2006. Rosso-Llopart ©2013 19