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Cumulative Flow Diagram (CFD)

The cumulative flow diagram (CFD) is a helpful tool for managing queues.
#cumulative-flow-diagram
Zettelkasten, December 01, 2021
## Notes - The cumulative flow diagram (CFD) is a helpful tool for managing queues. - The diagram uses: - Time as its horizontal axis; - Cumulative quantity as its vertical axis; - Cumulative arrivals at a process as one variable; - Cumulative departure as a second variable. - The vertical distance between the arrival line and the departure line is work that has arrived but not yet departed, the size of the queue at a time. - The horizontal distance between the lines tells the cycle time through the process for an item of work. - The total area between these two lines tells the size of the queue. - The slope of the arrival line tells the arrival rate of the queue. - The slope of the departure line tells the capacity of the process of emptying the queue. ![Cumulative Flow Diagram (CFD)](/images/originals/cumulative-flow-diagram.png) ## References [Flow. Chapter 3 - Managing Queues](/books/the-principles-of-product-development-flow#3-managing-queues)
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