When you analyze a process, you usually want to know three things: the average number of units in the process, the average flow rate, and the average flow time. Little’s Law shows how those three quantities are related.
- [Instructor] When you analyze a process,…you usually want to know three things:…the average number of units in the process,…the average flow rate,…and the average flow time.…In this movie, I will describe Little's Law,…which shows how those three quantities are related,…and show you how to find one value…if you know the other two.…I'll start in PowerPoint with an overview of Little's Law.…John Little, who was a professor at MIT,…discovered the relationship that I just described.…If you have a manufacturing or service process,…which is a subset of queueing theory, then, as I said,…the average number of units in the process…equals the average flow rate time the average flow time.…
To define terms, average units in the process is…production items or customers being served.…So if you're at a coffee shop and you see five people…who are in the process of getting their order…or are in line to get their order,…then that is the average number of humans.…Average flow rate is the number of units that…move through the process per period of time.…
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- Drawing process flow diagrams
- Calculating process capacity
- Identifying bottlenecks
- Determining cycle time and idle time
- Calculating labor
- Calculating utilization
- Analyzing batch processes
- Calculating optimal order quantities