Not many equations in this course, and

so let's greet every one of them that we encounter with great joy.

Time for the first equation in this course.

This equation is known as Little's Law.

Little's Law states that any process the average inventory is equal to the average

flow rate times the average flow time.

Now unlike most other types of things,

other equations in mathematics that I know that were proven by some ancient Greeks,

Little's Law is actually a fairly recent mathematical discovery.

We'll see how to apply Little's Law and that it is quite a powerful tool for

you as you are going to analyze processes with respect to inventory,

flow rate, and flow time.

To see the intuition rate behind Little's Law, let's take another look at some of

the analysis that we have done in an earlier session on the Subway restaurant.