Value Stream Mapping Data Box
The Value Stream Map Data Box is the technique used to capture and analyze data at each step of the Value Stream Map.
When to use
The Data Box should always be used with the Value Stream Map (VSM). A data box should be placed under each step in the VSM. To further highlight the importance of value-added time, two items from the data box, value-added time and non-value added time, can also be shown using the time ladder technique.
The VSM data box is the data collection and data recording aspect of value stream mapping. Each data box is identical in format for a given map. However, based upon the characteristics on the process, different data elements may be recorded for different processes.
Even then, there is normally at least one time-based element. The most common time-based data elements are value-added time and total time. There is typically at least one resource-based elements. Some of the more common resource-based elements are the number of people or the size of the batch. Also, there is normally at least one quality-based element. Commonly used quality-based elements are first-pass yield and step up-time.
In addition to the data boxes, a time ladder is often included with a VSM. The time ladder visually displays the value-added time and non-value added time for each step by showing the value-added time on the lower rung and the non-value added time on the upper rung for that step. The addition of the value-added time and non-value added time should be the step "total time".
Hints & tips
- Use average data in the data box, not best case or worst case.
- Time data is often available in business systems that collect time stamps when a particular step within the value stream is initiated or completed.
- It is OK if some of the data elements for some of the steps are “Not applicable.” Still maintain the same data elements in each data box and keep them in the same order. It makes it much easier to analyze in the next phase.
- I often make my data boxes with post-it notes when first creating a value stream map.
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