This is an approach to sampling that is appropriate for the output of processes that deliver a continuous flow of a product. In this plan, we start inspecting 100 % of the units coming from the process. After a certain number of items that have been inspected with no defects, the plan goes to inspecting only a fraction of items. This continues until we find a nonconforming unit. At that point, the plan reverts back to 100 % inspection following the same pattern.