1. Intro to Kanban Metrics Chuck Durfee 2. The Kanban Rules Visualize your work Limit work in progress Manage flow 3. Why Metrics 4. Queuing Theory 5. Throughput 6. Work in Progress 7. WIP Limit Benefits better lead times faster feedback forces removal of impediments 8. WIP Limit Signals 9. Cycle Time vs. Lead Time 10. Case Study 11. Case Study 12. Questions In the video, what was: Cycle time? Work in progress? What was the relationship between them? 13. Littles Law Comes from queuing theory Requires some assumptions All of these values are averages, not absolutes Cycle Time = WIP Throughput 14. Increasing Throughput Throughput = WIP Cycle Time 15. Work in Progress WIP = Throughput Cycle Time Start stopping, start finishing 16. Assumptions 17. Stable System Measurements are in consistent units During measurement period: Work in progress total must remain steady Work in progress average age must remain steady Questions What queuing approaches work for this? What effects do class of service have on this? What things are not implied by Littles Law? 18. Queue Discipline In software, we deal with non-homogenous: Delays Task durations 19. Continuous Flow Littles Law was originally proven for arrivals To apply it to departures: average arrival rate average departure rate and must be a closed system 20. Continuous Flow Diagram 21. CFD: WIP 22. CFD: WIP 23. CFD: Lead Time 24. CFD: Lead Time 25. CFD: Mean Delivery Time 26. CFD: Mean Delivery Time 27. CFD: Mean Arrival Time 28. der Takt (German) pulse beat Takt time = Time available Customer demand 29. Takt Time Example 30. How many stories need to be completed each day to make our release date? 31. Healthy CFD Patterns Lines for each step become parallel Steady Takt time synchronized effort Gap between lines narrows Decreasing work in process Slope of lines increases Throughput increasing through faster processing 32. Depth of Kanban 33. Acknowledgements Dan Vacanti, Littles Flaw http://vimeo.com/52683659 Donald Reinertsen, The Science of WIP Constraints http://vimeo.com/53321681 Paul Brodzinski, Cumulative Flow Diagram http://brodzinski.com/2013/07/cumulative-flow-diagram.html