A linear sequence of operations that is an alternative to a sequence of operations in the standard sequence.
You use an alternative sequence for example, if
For instance you can machine a work piece on conventional machine or on NC machines. A NC machine has a longer set-up time than a conventional machine. However the machining costs are considerably less. Therefore whether you use NC machines will depend on the lot size.
For instance, if you have a capacity problem, you have some production steps performed externally by a vendor.
You can only create alternative sequences in routings. You cannot create them in reference operation sets, reference rate routings or rate routings.