Material Flow
The movement of physical items through the entire value stream.
In mass production, products travel to centralized processes in
large batches, pushed forward on the instructions of a master
scheduling system (see illustration on p. 59). In lean production,
the process steps for different product families are moved together,
whenever possible, into tight process sequence so small amounts
of product can flow directly from step to step at the pull of the next
downstream process and of the end customer.
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