Single-piece flow is a key concept in a lean operation attempting to implement JIT inventory principles. But in order to implement single-piece flow, a company must be able to hold increased work in process inventory to support the smaller batch sizes production builds O build manufacturing orders (work orders) in batches change between products quickly and inexpensively by reducing setup times have supplier partners who are willing to deliver on a re-occurring weekly or monthly basis have a push system utilizing Kanbans to support manufacturing