3.3 – Define and document the list of prep codes. It is sometimes necessary to perform some work on a part prior to delivering it to the next storage location. For example, a part may need to be cleaned before an operator can use it, and that cleaning is best done in a batch. The Prep Code would be linked to a Standard Operating Procedure that describes how to do the prep. The Prep Code is also printed on the corresponding Kanban card or label.