大多数工程技术中使用的术语往往是物理特性，如速度、转弯率和油耗。虽然它们可能需要非常仔细地定义和控制它们的测量方式，但这些术语本身没有不同的解释。然而，可靠性、可维护性和可保障性（RMS）使用了数学定义的术语。因此，仅在迄今为止审查的文件中就定义了2000多个术语，其中许多术语有多种解释。术语定义的激增导致了人们试图将一个系统的性能与另一个系统进行比较时出现的问题。 例如，商用运输机的RMS性能是使用与军用战斗机或攻击机不同的指标来测量的。由于任务的性质，一些指标可能是独特的，这是公认的，但组成SAE委员会G-11的政府和行业从业者坚信，所有硬件系统都应该使用一些基本定义。因此，1986年初，SAE G-11R（资源）小组委员会成立，其任务是审查相关RMS文件，提取任何适用的术语，并通过逻辑选择系统汇编一系列术语和定义，这些术语和定义将被推荐给航空航天界。 毫无疑问，还有更多的文件需要审查它们所包含的定义，例如，我们已经明确将“软件可靠性”排除在本版本之外。此外，有必要将这些术语及其定义与商用飞机业务中常用的术语及其定义进行协调。计划SAE小组委员会的工作将继续导致未来的修订，从而扩大文件的范围。本文件由SAE G-11R小组委员会编制。这份文件的未来更新将继续反映国防和商业技术及标准的融合。

The terms used in most engineering technologies tend to be physical characteristics such as speed, rate of turn, and fuel consumption. While they may require very careful definition and control of the way in which they are measured, the terms themselves are not subject to different interpretations. Reliability, maintainability and supportability (RMS) however, use terms that are mathematically defined. As a result, there are more than 2000 terms defined in just the documents reviewed so far, many of which have multiple interpretations.This proliferation of definitions of the terms leads to problems when one attempts to compare the performance of one system to another. For example, the RMS performance of a transport aircraft from the commercial arena is measured using metrics that are not the same as those for a fighter or attack aircraft from a military service. It is accepted that some of the metrics may be unique because of the nature of the missions, but it is the strong conviction of the Government and Industry practitioners who make up the SAE Committee G-11 that there should be some fundamental definitions used for all hardware systems.Accordingly, in early 1986 the SAE G-11R (Resources) subcommittee was formed and tasked to review relevant RMS documents, extract any applicable terms, and through a system of logical selection compile a series of terms and definitions that would be recommended for the Aerospace Community. There are undoubtedly many more documents that need to be reviewed for the definitions they contain, for example, we have specifically excluded “software reliability” from this edition. Also, there is a need to reconcile the terms and their definitions with those commonly used in the commercial aircraft business. It is planned that the SAE subcommittee work shall continue to result in future revisions that will broaden the scope of the document. This is the document that has been prepared by the SAE G-11R subcommittee. Future updates of this document will continue to reflect the converging of defense and commercial technology and standards.