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Basic Queue Theory and Gantt Charts

Basic Queue Theory and Gantt Charts. Steve Harrison Wednesday 20 th January 2014 Seminar Room 2 MEC. Topics. Variation – A recap Basic Queue theory Gantt Charts – Process Building Blocks Other Variation Concepts.

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Basic Queue Theory and Gantt Charts

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  1. Basic Queue Theory and Gantt Charts Steve Harrison Wednesday 20th January 2014 Seminar Room 2 MEC

  2. Topics • Variation – A recap • Basic Queue theory • Gantt Charts – Process Building Blocks • Other Variation Concepts

  3. “If I had to reduce my message for management to just a few words, I’d say it all had to do with reducing variation.”W. Edwards Deming

  4. Variation – what to do?

  5. Application – Responding to Variation Identify the Cause: If Positive: Maximise, optimise, replicate, standardise. If Negative: Minimise, eliminate. Special Cause Variation Reduce variation: Increase precision - make the process even more reliable. Not satisfied with median performance (result): Redesign process to get a better result Common Cause Variation 6

  6. Variation and Queues

  7. Variation & Queues 100% 80% 50% Procedure Time (Minutes) Consecutive Patients 80% rule is the most efficient balancing waiting and waste

  8. How to calculate • =(((Max – Min)/100)*80 )+ Min • 23 – 7 = 16 • 16/100 = 0.16 • 0.16*80 = 12.8 • 12.8 + 7 = 19.8 • 19.8 approx 20mins

  9. Plan Cycle Time = 20m

  10. Cycle time at 80% - PDSA 1 More Reliable More Variable

  11. PDSA - Plan

  12. PDSA - Plan

  13. PDSA – Do & Study

  14. Demand is increasing.... More slots needed...

  15. 80% = 21mins 3hrs = 8 Patients

  16. 80% = 18mins 80% = 21mins 3hrs = 8 Patients 3hrs = 10 Patients

  17. 80% = 21mins 80% = 18mins 80% = 14mins 3hrs = 8 Patients 3hrs = 10 Patients 3hrs = 12 Patients

  18. How do you reduce common cause variation?

  19. GSM

  20. More Queuing....

  21. Capacity required = 27

  22. Capacity required = 27

  23. Capacity required = 49 (5 beds less than separate units ~£400,000)

  24. Lung Cancer Clinic 13 + 11 = 24

  25. Lung Cancer - pooled

  26. And Finally - More Queuing....

  27. Which is best? S C Q S C Q C Q C Q S C Q S S C Q S

  28. S And Finally - Which is best? C Q Long C Q Short C Q Long S S C Q Long S C Q Short S

  29. Discussion

  30. Thanks!

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