In which of the following environments is capable-to-promise (CTP) more appropriate than available-to-promise (ATP)?

CTP is suitable for engineer-to-order or make-to-order environments where production and procurement are triggered only upon receipt of a customer order. In contrast, ATP is ideal for environments with finished goods in stock. Specialty chemicals often require unique formulations and packaging, thus CTP helps assess material and capacity availability before committing.

“CTP applies where product is not inventoried, such as in make-to-order or engineer-to-order environments... CTP checks material, capacity, and lead times to confirm if delivery can be promised.”

— Source: CPIM Master Planning of Resources (MPR) module; APICS Dictionary