基于性能的测量系统（PBMS）是一种新型的测量系统 美国环境保护局开发的方法 美国环保局（USEPA）修改分析方法。方法修改 旨在提高性能，提高实验室效率， 或者降低成本，最终导致 更好的水质数据。美国环保局的方法1622和1623是第一种 该机构的微生物方法将由PBMS修改。 实验室和制造商有两种引进的途径 方法修改以提高性能或效率。 当单个实验室 想要更改内部方法中的组件或步骤 使用当制造商或其他组织 想要证明修改后的 全国范围内使用的方法版本。 方法灵活性的PBMS方法在以下方面很简单: 原则，但应用该方法的实际“操作”可能是 令人困惑，即使是那些进行一级研究的实验室。 本文详细介绍了如何使用PBMS，包括进行修改 方法可接受性研究，并提供 成功和不成功的修改结果。 包括20个参考文献和表格。

The performance-based measurement system (PBMS) is a new approach developed by the US Environmental Protection Agency (USEPA) to modify analytical methods. Method modifications are made to improve performance, increase laboratory efficiency, or reduce costs, outcomes that should ultimately lead to better quality water data. USEPA methods 1622 and 1623 are the first of the agency's microbiological methods to be modified by PBMS. Laboratories and manufacturers have two avenues for introducing method modifications to improve performance or efficiency. Tier 1 validation is used when an individual laboratory wants to alter a component or step in the method for in-house use. Tier 2 validation is used when a manufacturer or other organization wants to demonstrate acceptable performance of a modified version of the method for nationwide use. The PBMS approach to method flexibility is straightforward in principle, but the actual "how-to" of applying the approach can be confusing, even for those laboratories conducting tier 1 studies. This article details how to use PBMS, including conducting modified method acceptability studies, and offers case studies of successful and unsuccessful modification outcomes. Includes 20 references, tables.