本文件为可用于评估不确定性来源的一些方法提供了指导。需要注意的是，有许多合法的方法可用于分析整体不确定性，本文件中的方法仅为说明性方法。

This document provides guidance for some methods that could be used to evaluate the sources of uncertainty. It is important to note that there are many legitimate methods for analyzing the overall uncertainty and that the methods in this document are illustrative only.