Milk runs are a popular concept for material delivery within a plant and even across multiple plants. It is very much based on the philosophy of pull, keeping inventories down, and making material supply easier.
However, it is only suitable for mass-produced goods, or more precisely for identical components and identical parts, even if they go into different product variants. Additionally it can also be used with kitting. This post starts a series on the topic of milk run with an introduction to the topic.