选择CAD/CAM系统的过程可能很简单，但许多公司会因为可用的系统种类繁多而分心。确定哪些CAD/CAM供应商术语适用于其应用程序也非常困难。本文介绍了NIST制造技术中心处理250多个不同机械CAD/CAM软件包和数百个应用程序和功能的起点和方式。MTC每年要为数百家公司解决这一问题，并已设计出将这一问题缩小到一定规模的方法。由此产生的方法可以在大多数人调查一个包裹所需的时间内对250多个包裹进行评估。 这些中心之间的维护、准确性和协调都得到了解决。本文描述了选择供应商短名单的过程以及成本论证程序。在正常情况下

THE PROCESS OF SELECTING A CAD/CAM SYSTEM CAN BE SIMPLE BUT MANY COMPANIES GET DISTRACTED BY THE WIDE VARIETY OF SYSTEMS AVAILABLE. IT IS ALSO VERY DIFFICULT TO DETERMINE WHICH CAD/CAM VENDOR TERMS APPLY TO THEIR APPLICATIONS. THIS PAPER DESCRIBES THE STARTING POINT AND HOW NIST'S MANUFACTURING TECHNOLOGY CENTERS DEAL WITH MORE THAN 250 DIFFERENT MECHANICAL CAD/CAM PACKAGES AND HUNDREDS OF APPLICATIONS AND FEATURES. THE MTCS HAVE TO DEAL WITH THIS PROBLEM FOR HUNDREDS OF COMPANIES A YEAR AND HAVE DEVISED METHODS TO TRIM THIS PROBLEM DOWN TO SIZE. THE RESULTING METHOD ALLOWS THE EVALUATION OF OVER 250 PACKAGES IN THE TIME IT TAKES MOST PEOPLE TO INVESTIGATE ONE PACKAGE. MAINTENANCE, ACCURACY, AND COORDINATION BETWEEN THE CENTERS ARE ADDRESSED. THE PROCESS OF SELECTING THE SHORT LIST OF VENDORS IS DESCRIBED AS WELL AS THE COST JUSTIFICATION PROCEDURES. UNDER NORMAL CIRCUMSTANCES THE ENTIR