Starbucks, Queueing Theory, Constraints, and Lean
"If establishing a consistent order fulfillment drumbeat is important, Starbucks needs to do the following:
1) Reduce, immediately, the number of product combinations.
2) Model the properties of each of those combinations in both time, material, information, steps, and flow. But, focus on the 80/20 â€“ the most ordered combinations first..."