【zone是什么意思】...和trade-offzone是什么意思?2者有什么关系吗

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【答案】 Firm and trade-off zones define the degree to which schedule lines are to be regarded as binding.Scheduled delivery dates that lie in the near future can represent a firmer mitment than those that are further away in time.You can define a firm zone and a trade-off zone for an item of a scheduling agreement:The firm zone defines the point in time (calculated from the current date) at which the period when the vendor has the go-ahead for production ends.The firm zone begins on the current (today’s) date.Delivery schedule lines falling within this zone count as firm and fully binding.The trade-off zone defines the point in time (calculated from the current date) at which the period when the vendor has the go-ahead for the purchase of input materials ends.The trade-off zone begins at the end of the firm zone.Delivery schedule lines falling within this zone count as semi-firm.Delivery schedule lines lying beyond the firm and trade-off zones fall within the planning zone.The firm and trade-off zones are printed out in the delivery schedule for information purposes.It is assumed that procurement with respect to each delivery schedule line is carried out on the terms applicable to the zone in which the line in question falls.