Yamazumi is a Japanese word translated as huge mound, heap, or pile. A Yamazumi chart is simply a stacked bar graph. But by plotting process cycle time by process steps and listing the tasks within a process step as Value Add or Non-value Add, it becomes a powerful tool to not only aid in balancing workload but in highlighting waste.

A Yamazumi chart (or Yamazumi board) is a stacked bar chart that shows the source of the cycle time in a given process, the chart is used to graphically represent processes for optimisation purposes.

What Are Lean Tools? The Japanese word for waste is muda, which is defined as “uselessness.” Lean tools are designed to reduce Muda in organizations and improve quality control. In other words, Lean tools seek to eliminate processes that aren’t valuable.

The operator balance chart, also known as a percent load chart, operator loading diagram, cycle time/takt time bar chart, or line balance analysis graph, provides the lean practitioner with insight into how equalized operation time is among the workers within a given process, line or cell.

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Often, a target cycle time (mean cycle time) will be plotted to aid line balancing activities. The Yamazumi chart can be used for both process Waste Elimination or Line Balancing activity. Process steps can be rearranged or deleted to optimise and balance the target process.

Overview. Yamazumi is a Japanese word that literally means to stack up. Process tasks are individually represented in a stacked bar chart, these can be categorized as either Value Added, Non-Value Added or Waste. The mean duration time of each task is recorded and displayed within the bar chart.

Yamazumi is a Japanese term meaning “to stack up,” and the chart itself is a stacked bar chart. Lean improvement teams utilize these charts to identify wastes and continuously improve processes.