Kanban best practice of setting work-in-progress limits at 1.5 times the number of team members in a workflow stage to prevent overload while maintaining flow.
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WIP Limit 1.5x Rule
The WIP Limit 1.5x Rule is a starting guideline for setting work-in-progress limits in Kanban systems. It suggests setting the WIP limit at 1.5 times the number of people working in that stage. For example, if three developers handle "In Progress," a WIP limit of 4-5 tasks prevents overload while maintaining flow.
WIP Limit = Number of Team Members × 1.5
Examples:
Too Low (1:1 ratio):
Too High (3x or more):
Just Right (1.5x):
Research shows:
Typical stages:
Example Development Team:
Stop Starting, Start Finishing:
Benefits:
Before WIP Limits:
After 1.5x WIP Limit (5 items):
Signals:
Try lower limit when:
Signals:
Try higher limit when:
Cycle Time:
Throughput:
Flow Efficiency:
Blocker Frequency:
Before limits:
After 1.5x limit:
Observation:
Diagnosis:
Solutions:
Collaboration Increases:
Focus Improves:
Predictability:
"I work faster with multiple tasks"
"We need flexibility"
Different limits for subtypes:
Limit by effort, not count:
Jira:
Trello:
Azure DevOps:
Teams implementing 1.5x WIP limits typically see:
1.5x is a starting point, not a rule.
Use it as initial guidance, then:
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