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Barriers to Flow
Any barrier, physical or not, that prevents the passing of one unit of work directly to the next process without the work stopping.
Batch and Queue
A processing method where multiple pieces of work (often referred to as a "batch" or "lot") are processed and/or passed together from one operation to the next. Upon arrival at the next process some or all of these pieces of work may wait in a "queue" to be worked on. Contrast with One-piece Flow.