Continuous flow is just that—the flow of value-add never stops. Ideally, a process would continue to add value without ever stopping during the production process.

Use: Lean practitioners should relentlessly strive for continuous flow through the reduction of waste.  Any time a process stops, lead time is lengthened, the customer has to wait for the product or service, and it is costing more money than if the flow could be continuous in nature.

Six Sigma Terminology