With an Toyota experience, areas cause most concern:
•Quality–that is too poor to satisfy customers
•Production level – making products, or having capacity, that is not currently needed
•Processing–having unnecessary, too complicated or time-consuming operations
•Waiting –for operations to start or finish, for materials, repairs, and so on
•Movement–with products making unnecessary, long, or inconvenient movements during operations
•Stock–too much stock that needs storing and raises costs.