这些指南涉及尺寸测量不确定度的评估。重点放在适合工业从业者的简化方法上。介绍的方法与《测量不确定度表示指南》（GUM）一致，GUM是国家和国际公认的测量不确定度量化方法。使用这些指南并不排除在不确定性评估过程中采用更先进的方法。

These guidelines address the evaluation of dimensional measurement uncertainty. Emphasis is placed on simplified methods appropriate for the industrial practitioner. The introductory methods presented are consistent with the Guide to the Expression of Uncertainty in Measurement (GUM), the nationally and internationally accepted method to quantify measurement uncertainty. The use of these guidelines does not preclude more advanced methods to be employed in the uncertainty evaluation process.