Flow requires (and produces) high quality

Flow requires (and produces) higher quality than Batch & Queue

As you can see from this chart - flow processes demand high quality in order to function - and therefore generate high-quality output, almost as a by-product.

	Batch & Queue	Flow
Effect of defective part on work flow	There are usually other batches of work to work on while the defective batch gets reworked or scrapped & replaced	The entire production process screeches to a halt until the problem is resolved (this is called andon or jidoka)
Typical number of defective parts made before problem is noticed	Usually at least one large batch - and often more than one	One unit (assuming that the batch size is one)
Typical amount of time before the problem is noticed	The total time between operations - which can often involve WIP inventory stored for very long periods	Moments
Typical measures of quality	Can be very sloppy. Batch & queue can tolerate poor quality.	Flow cannot tolerate poor quality. Flow processes demand high quality in order to function - and therefore generate high-quality output almost as a by-product.