Which of the following is considered waste?

Storing extra items in a warehouse is considered waste because it represents excess inventory that does not directly contribute to the value of the product or service being provided to the customer. This excess typically ties up valuable resources, such as space and capital, and can lead to additional costs associated with maintenance, potential obsolescence, and overstocking.

On the other hand, properly training operators, packaging products for shipment, and handling customer orders are activities that generally add value. Training ensures that employees are skilled and efficient, packaging is necessary for delivering products safely and effectively, and handling customer orders is essential for meeting customer demand and service expectations. These activities support the flow of production and directly contribute to customer satisfaction, making them essential components of an efficient operation.