A 对于雇主在市场中的竞争性有价值的知识。
B 在此行业内比较缺少的知识，因此对美国雇主在外国的经营有利。
C 申请者从事的多项任务已经提高了雇主的生产力，竞争性，形象或财政状况。
D 只有通过在雇主企业的工作经验才能获得的特别知识。
E 对生产过程的充分了解，而这种知识又不能很容易得传或教给另外一个人。
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