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Critical Chain Project Management Fred Wiersma TTI-30 June 2000
Contents ,[object Object],[object Object],[object Object]
Problems with traditional scheduling methods ,[object Object],[object Object]
Single project problems ,[object Object],[object Object],[object Object]
Single project problems (2) ,[object Object],[object Object],[object Object]
Single project problems (3) ,[object Object],[object Object],[object Object]
Single project problems (4) ,[object Object],[object Object],[object Object]
Single project problems (5) ,[object Object],[object Object],[object Object]
Single project problems: Summary ,[object Object],[object Object],[object Object],[object Object],[object Object]
Example: Bad Multitasking Task A Task B Task C Tasks assigned to a resource 3 days 3 days 3 days Should happen : Task A Task B Task C 3 days 3 days 3 days Could happen: B B A A C C 6 days 6 days 6 days Does happen : B B A A C C 7 days 7 days 7 days Lost Productivity
And some more… ,[object Object],[object Object]
And more... ,[object Object]
What can we do? ,[object Object],[object Object]
Identify the Critical Chain ,[object Object],The Critical Chain The longest path through the network considering  both  task  and  resource  dependencies A.)  Eliminate resource contention 2:Dev 2:Tst 5:Design 2:Tst 2:Dev 2:Dsn 3:Proto 4:Dev 2:Dsn 3:Proto 4:Dev 2:Dsn 3:Proto 4:Dev
Rules of thumb ,[object Object],[object Object],[object Object]
Manage the Project Buffer Okay Plan Act 0%  33%  66%  100% Percent Buffer Consumed Percent Critical Chain Remaining 100%  67%  33%  0% Manage on buffer status with respect to work completed
Rules of thumb (3) ,[object Object]
Updating Tasks Design :   “ We completed the 2-day task, but we still have 4 days to go on our other task” Proto : “ We haven’t had a chance to get to our task" Project Report CC Complete: 15% PB Consumed: 30% Copyright © 1999 by ProChain Solutions, Inc. All rights reserved. 2 Dev 2:Dsn 3:Proto 4: Dev 2:Tst 6.5: Project Buffer 2: FB 5:Design Today Projected task times Buffer consumption Projected task time
The Multi-Project Solution ,[object Object],[object Object],[object Object],[object Object],Copyright © 1999 by ProChain Solutions, Inc. All rights reserved.
Multi-Project Scheduling 1 2 1. Set projects at their due dates 3. Collect drum resource tasks 5. Reschedule projects  Drum Schedule 4. Resolve drum contention 2. Select the drum resource(s) 2 Dev 2:Dsn 3:Proto 4: Dev 2:Tst 6.5: Project Buffer 2: FB 5:Design 2 Dev 2:Dsn 3:Proto 4: Dev 2:Tst 6.5: Project Buffer 2: FB 5:Design 2 Dev 4: Dev 2 Dev 4: Dev 2 Dev 4: Dev 2: FB 5:Design 2 Dev 2:Dsn 3:Proto 4: Dev 2:Tst 6.5: Project Buffer 2 Dev 4: Dev
References ,[object Object],[object Object],[object Object]
References(2) ,[object Object],[object Object],[object Object],[object Object]

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Critical Chain Project Management

  • 1. Critical Chain Project Management Fred Wiersma TTI-30 June 2000
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10. Example: Bad Multitasking Task A Task B Task C Tasks assigned to a resource 3 days 3 days 3 days Should happen : Task A Task B Task C 3 days 3 days 3 days Could happen: B B A A C C 6 days 6 days 6 days Does happen : B B A A C C 7 days 7 days 7 days Lost Productivity
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16. Manage the Project Buffer Okay Plan Act 0% 33% 66% 100% Percent Buffer Consumed Percent Critical Chain Remaining 100% 67% 33% 0% Manage on buffer status with respect to work completed
  • 17.
  • 18. Updating Tasks Design : “ We completed the 2-day task, but we still have 4 days to go on our other task” Proto : “ We haven’t had a chance to get to our task" Project Report CC Complete: 15% PB Consumed: 30% Copyright © 1999 by ProChain Solutions, Inc. All rights reserved. 2 Dev 2:Dsn 3:Proto 4: Dev 2:Tst 6.5: Project Buffer 2: FB 5:Design Today Projected task times Buffer consumption Projected task time
  • 19.
  • 20. Multi-Project Scheduling 1 2 1. Set projects at their due dates 3. Collect drum resource tasks 5. Reschedule projects Drum Schedule 4. Resolve drum contention 2. Select the drum resource(s) 2 Dev 2:Dsn 3:Proto 4: Dev 2:Tst 6.5: Project Buffer 2: FB 5:Design 2 Dev 2:Dsn 3:Proto 4: Dev 2:Tst 6.5: Project Buffer 2: FB 5:Design 2 Dev 4: Dev 2 Dev 4: Dev 2 Dev 4: Dev 2: FB 5:Design 2 Dev 2:Dsn 3:Proto 4: Dev 2:Tst 6.5: Project Buffer 2 Dev 4: Dev
  • 21.
  • 22.