Webinar on Agile Estimation : iZenBridge

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This presentation covers basic details of agile estimation, it also elaborate how the sizing is done using story points and ideal days. This presentation also discuss the difference between ideal days and story point based estimation approach.

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Webinar on Agile Estimation : iZenBridge

  1. 1. © 2013 iZenBridge | CONFIDENTIAL iZenBridge Agile Estimation Saket Bansal , PMP® , PMI-ACP® iZenBridge Consultancy Private Limited
  2. 2. © 2013 iZenBridge | CONFIDENTIAL Agenda 1 • Agile Estimation 2 • Story Points / Ideal Days 3 • Doing Estimation
  3. 3. © 2013 iZenBridge | CONFIDENTIAL What Is Estimation? • Estimation is a prediction of how long a project will take or how much it will cost • Approximate judgment-Oxford English Dictionary • A prediction that is most likely to be true
  4. 4. © 2013 iZenBridge | CONFIDENTIAL Estimation AccuracyUncertaintyinEstimation Time in Project
  5. 5. © 2013 iZenBridge | CONFIDENTIAL Estimation Process How long / How much? Calendar Days & Money How long for an item ? For one person ? Effort Can we measure the software size? Size •Use Case Points •Function Points •Story Points •Ideal Days
  6. 6. © 2013 iZenBridge | CONFIDENTIAL Traditional Estimation Size Productivity Effort Project Dependencies Duration
  7. 7. © 2013 iZenBridge | CONFIDENTIAL Agile Estimation Size Calculation Duration 400 Story Points 20 Velocity 20 Iterations
  8. 8. © 2013 iZenBridge | CONFIDENTIAL Planning Onion Strategy Portfolio Product Release Iteration Day Estimation Release Level Iteration Level Estimation
  9. 9. © 2013 iZenBridge | CONFIDENTIAL Two Levels of Planning Release / Project (3 to 12 Months) Estimation for long term plan: High Level Estimation for given iteration: Detailed in Hours Iteration 2 to 4 Weeks Rolling Wave
  10. 10. © 2013 iZenBridge | CONFIDENTIAL Estimation at two Levels # PBI Description Size 1 As a Job Seeker I can create multiple profile 3 2 2 3 3 8 13 20 # SPI Description Hrs 1 Determine rules about who can create multiple profile. 1 2 Specify acceptance tests to show how this should work. 2 3 Design user interface. 1 4 Code user interface. 5 5 Add tables and stored procedures to database. 6 Automate tests. 4
  11. 11. © 2013 iZenBridge | CONFIDENTIAL
  12. 12. © 2013 iZenBridge | CONFIDENTIAL Agenda 1 • Agile Estimation 2 • Story Points / Ideal Days 3 • Doing Estimation
  13. 13. © 2013 iZenBridge | CONFIDENTIAL It's about Relative ranking
  14. 14. © 2013 iZenBridge | CONFIDENTIAL Story Point • The “bigness” of a task • Influenced by • How hard it is / Complexity • How much of it there is / Volume of Work • Risk / Uncertainty • Points are unit-less • We can use math
  15. 15. © 2013 iZenBridge | CONFIDENTIAL Ideal Days… • How long something would take if • It’s all you worked on • You had no interruptions • And everything you need is available • The elapsed time is much longer (Why?)
  16. 16. © 2013 iZenBridge | CONFIDENTIAL Ideal Days / Story Points Story Points Ideal Days Are typically faster, since we are doing relative ranking My ideal days cannot be added to your ideal days, so it takes time to estimate Help drive cross-functional behavior While estimating in ideal days sometime team start thinking in their functional boundaries Difficult to estimate first few stories Ideal days are easier to estimate at first Pure measure of size, sometime difficult to explain outside team Ideal days are easier to explain outside the team Do not decay Start decaying with time Measurement of size so does not give direct indicator for efficiency Force companies to confront time wasting activities
  17. 17. © 2013 iZenBridge | CONFIDENTIAL forum.iZenBridge.com
  18. 18. © 2013 iZenBridge | CONFIDENTIAL Agenda 1 • Agile Estimation 2 • Story Points / Ideal Days 3 • Doing Estimation
  19. 19. © 2013 iZenBridge | CONFIDENTIAL Doing Estimation • The Estimation scale should be non linear • Frequently used estimation scales • 1, 2, 3, 5, and 8 , 13 • 1, 2, 4, and 8 • We estimate better within one order of magnitude • Epics can have range like 20,40 and 100
  20. 20. © 2013 iZenBridge | CONFIDENTIAL Estimators with deck of cards PO Clarifies the story Each Estimator selects a card Cards are turned over Discuss Differences Agreement Write the estimate No Yes Planning Poker
  21. 21. © 2013 iZenBridge | CONFIDENTIAL Stay Connected YouTube www.youtube.com/izenbridge LinkedIn Group PMI-ACP: Agile Certification Made Easy Saket.Bansal@iZenBridge.com www.iZenBridge.com forum.iZenBridge.com

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