Notorious weaknesses in the waterfall development method have been widely criticized, yet the method still remains very popular.
尽管瀑布开发方法的缺点受到了广泛的批评，但是它仍然非常流行。
But correcting a weak or erroneous use case at test development time can be difficult and costly, especially when using a waterfall-based development method.
但是在测试开发时期修正一个薄弱且错误的用例十分困难而且成本很高，尤其是当使用一个基于瀑式开发方法的时候。
Eventually, the DOD realized that the Waterfall method was not working and in 1994 replaced DOD-STD-2167 with MIL-STD-498, which supports iterative development.
后来，美国国防部意识到瀑布方法是行不通的，并最终于1994年发布了取代DOD-STD - 2167的标准MIL - STD - 498，支持迭代式开发。
Eventually, the DOD realized that the Waterfall method was not working and in 1994 replaced DOD-STD-2167 with MIL-STD-498, which supports iterative development.
后来，美国国防部意识到瀑布方法是行不通的，并最终于1994年发布了取代DOD-STD - 2167的标准MIL - STD - 498，支持迭代式开发。
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