因果联系法是对所搜集的情报中的因果关系进行分析研究的一种方法。此种方法可以从正反两个方向推断。正方向推断，从原因推断结果;反方向推断，从结果推断原因。通过正反推断，为企业加工出高质量的情报产品。如，天津服装研究所的情报人员，为了调查美国服装市场情况，阅读纽约的报纸，时常发现"备有特小女装"或者 "本店设有特小女装专柜"等广告。据此，他们反向推断，其所以出现如此广告，正说明美国服装市场特小女装短缺。以后又收集到刊
登在服装报上的一篇评论，指出美国特小身材妇女因买不到合身衣服而怨声载道，从而证实了美国服装市场特小女装短缺。情报人员通过对这些情报的因果分析推论，为企业向美国出口特小女装的决策提供了依据。
Contact the law in cause and effect
Contact the law to be a method of analysing and researching to the causality in the information collected in cause and effect. This kind of method can be inferred from two positive and negative directions. The pros infers the result from the reason to inference; Infer, infer the reason from the result in the opposite direction. Through positive and negative inference, that enterprises process the high-quality information products. For instance, intelligence agent of the clothes research institute of Tianjin, in order to investigate the American clothes market situation, read the newspapers of New York, often find " there is specially small women‘s clothing "ing or such advertisements as " there are special counters of specially small women‘s clothing in this shop ". In view of the above, they infer its appear so advertisement, prove American clothes market specially little women‘s clothing shortage backward. Collect, publish in clothes offering one commenting at later, point out U.S.A. little stature woman cries of discontent rise all round because buy the fit clothes specially, thus verified the specially small women‘s clothing shortage of market of American clothes. The intelligence agent passes and analyzes the inference about the cause and effect of the information, it is the decision that enterprises exported the specially small women‘s clothing to U.S.A. that is offered the basis.
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