在ISO9000系列当中的标准文件是有很多份的，如ISO9001、ISO9002、ISO9003及ISO9004等，其中ISO9001、ISO9002及ISO9003这三份文件是用作考核之用，So，证书只会分ISO9001、ISO9002及ISO9003三个，实际上不会有ISO9000证书存在。
其余文件是参考支援的作用，如ISO9000这个文件只是一个指引，是说明ISO9001、ISO9002及ISO9003是什么。 ISO9001、ISO9002及ISO9003是三个品保模式，这三个标准分别在于所需符合的条文数目不同，ISO9001有几十个条文要求，ISO9002少一个设计方面的条文要求，所以适合加工行业，而ISO9003则只有ISO9001内其中16个要求，应用范围更窄。
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