11.Heijunka (Level Scheduling):

Leveling, which means smoothing the preparation or workload in the industrial, is the Heijunka translation. This approach is important to the success of the development of "continuous flow" in practice. It compensates for the fact that orders seldom arrive at a regular pace, in practice [46].

There are two forms of grading:

Volume leveling: the smoothed output produces the average of the orders over a given time, as the orders are of different amounts per day,

leveling by product type: Smoothing is a little more complex, it is a matter of mixing the various items every day according to their processing period to achieve an equal (or nearly identical) average time every day.

The two strategies are merged in practice. The Heijunka box has been developed as a visual medium: it consists of boxes, each representing the type of product (in columns) and the day of the week (in rows), the number of sheets per box being the number of products of the type considered to be manufactured on that day, the sum of the products in the same column being the date of manufacture.
