One of the waste in the production of lean manufacturing activity is due to rework activity monconforming product. Labor and production equipment must be used to rework of defective product.If the product is rejected by the customer would not want to do rework if it is still possible. Rejection by the customer because of nonconforming product may vary. For example, incompatibility between the box and its contents, should contain the product type of the A1 but the label on the written box A2. Such action is still easy to rework that is by replacing the label boxes with the same type with the contents.

The most difficult is if there is mixing the product with different characteristics have However the same physical shape. Before rework carried out an inspection that requires a long time in addition to rework itself.