Kanban Rule #6: The number of Kanbans is reduced carefully to lower inventories and to reveal problems.
Applying this rule in your studio: in a studio where sales levels are consistent, then reducing the number of kanbans is one way to reduce inventory levels, which improves cash flow and increases production speed. However, in a studio where sales levels are growing (and often growing quickly!), then it’s more common to add kanbans than to take them away. Reducing kanbans is recommended for when sales level off at your studio or if you’re working to reduce the total inventory you have on hand (see Chapter 12).