The Cumulative Flow Diagram (CFD) provides a graphical representation of how the work is moving through the system, helping stabilize the system, act upon bottlenecks and control the scope of work. It is a simple, yet very informative tool that depicts the work in progress (WIP), entry rate, exit rate, lead time, throughput, elapsed time, completed, remaining, and total scope of work.
Calculation Logic for CFD Chart
The CFD is a stacked area chart. The lowermost region represents the cumulative count of the cards that have been completed, i.e., have moved from the selected region forward to the right, have entered the “Done” column, have been Archived, or moved to some other swim. All other regions represent the WIP of columns stacked top to bottom in order of their position in the selected region. The CFD for each day is calculated by recording the WIP of each column at the end of the day, along with the number of cards completed on that day.
The tool-tip on the CFD chart shows the WIP as well as average aging (the average time the cards have spent in the column) for each queue for the given day.
Histogram of cycle time. the x-axis is the cycle time, and y-axis represents the number of cards that have cycle time that falls within the time-bucket representing the width of the bar. The outliers are colored in red.
Cards that exit the selected region of the value-stream during the time interval selected in the Temporal Range Filter, pass the filtering criteria and have entry time defined form the basis for cycle time calculation. These cards are grouped into Time unit wide buckets based on their cycle time to form the histogram. Cards that fall outside the box-and-wiser plot are considered to be outliers and are colored in red.
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