W1: The Principle of WIP Constraints Constrain WIP to control cycle time and flow
W2: The Principle of Rate-Matching
WIP constraints force rate-matching
W3: The Principle of Global Constraints
Use global constraints for predictable and permanent bottlenecks
W4: The Principle of Local Constraints
If possible, constrain local WIP pools
W5: The Batch Size Decoupling Principle
Use WIP ranges to decouple the batch sizes of adjacent processes
W6: The Principle of Demand Blocking
Block all demand when WIP reaches its upper limit
W7: The Principle of WIP Purging
When WIP is high, purge low-value projects
W8: The Principle of Flexible Requirements
Control WIP by shedding requirements
W9: The Principle of Resource Pulling
Quickly apply extra resources to an emerging queue
W10: The Principle of Part-Time Resources
Use part-time resources for high variability tasks
W11: The Big Gun Principle
Pull high-powered expets to emerging bottlenecks
W12: The Principle of T-Shaped Resources
Develop people who are deep in one area and broad in many
W13: The Principle of Skill Overlap
Cross-train resources at adjacent processes
W14: The Mix Change Principle
Use upstream mix changes to regulate queue size
W15: The Aging Principle
Watch the outliers
W16: The Escalation Principle
Create a preplanned escalation process for outliers
W17: The Principle of Progressive Throttling
Increase throttling as you approach the queue limit
W18: The Principle of Differential Service
Differentiate quality of service by workstream
W19: The Principle of Adaptive WIP Constraints
Adjust WIP constraints as capacity changes
W20: The Expansion Control Principle
Prevent uncontrolled expansion of work
W21: The Principle of the Critical Queue
Constrain WIP in the section of the system where the queue is most expensive
W22: The Cumulative Reduction Principle
Small WIP reductions accumulate
W23: The Principle of Visual WIP
Make WIP continuously visible
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