以下关于因果图法测试的叙述中，不正确的是（ ）。
- A.因果图法是从自然语言书写的程序规格说明中找出因和果
- B.因果图法不一定需要把因果图转成判定表
- C.为了去掉不可能出现的因果组合，需要标明约束条件
- D.如果设计阶段就采用了判定表，则不必再画因果图
正确答案及解析
正确答案
解析
因果图导出测试用例的步骤
分析程序规格说明的描述中：原因和结果
分析程序规格说明描述中语义的内容，并将其表示成连接各个原因与各个结果的“因果图”
标明约束条件
把因果图转换成判定表
为判定表中每一列表示的情况设计测试用例
因果图法需要转换成判定表，然后再设计测试用例
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