Engineer to Order (ETO) is used when products are unique and extensively customized for the specific needs of individual customers
Make to Order (MTO) relies on relatively small quantities, but more complexity
Requires much interaction with customer to work out design and specification
Usually shipped direct to customer
Assemble to Order (ATO) is when base components are made, stocked to forecast, but products are not assembled until customer order is received
Manufacturing postponement practiced here
Make to Stock (MTS) features economies of scale, large volumes, long production runs, low variety, and distribution channels