MSA手册第二章第B节选择/开发试验程序之段落翻译理解

MSA手册第二章第B节选择/开发试验程序，当阐述到：当选择或开发一个评估程序时，一般要考虑的问题包括：
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How often should Phase 2 testing be performed? This decision may be based on the statistical properties of the individual measurement system and the consequence to the facility, and the facility’s customers of a manufacturing process that, in effect, is not monitored due to a measurement system not performing properly.

为了好理解，我将每句话翻译成中文（网的中文版针对此句翻译的不好），见下：

How often should Phase 2 testing be performed （第 2 阶段试验应每隔多久进行一次）？This decision may be based on the statistical properties of the individual measurement system and the consequence to the facility（这要取决于特定测量系统的统计特征和此设备的重要性，（设备应该是一个制造过程的客户的对此产品的测量设备，是这样理解吗？））, and the facility’s customers of a manufacturing process that, in effect, is not monitored due to a measurement system not performing properly（这句又是如何翻译？）.

请指教！

谢谢！