This study is an overview of the capability evaluation of measurement systems.Principally, the determination of capability of a measurement system is an importantaspect of quality and process improvement initiatives. In practice, various methods aredeveloped and used for determining measurement system capability. As a measurement tool,potential effectiveness of gauge should be considered and significant factors should beidentified for that purpose. A set of procedures referred to as Measurement SystemsCapability Studies are conducted for assessing capability of gauge, isolating sources ofvariability in the system, evaluating how much of total observed variability is due togauge, and investigating two components of measurement error: repeatability andreproducibility of gauge. Gauge Repeatability & Reproducibility (GaugeR&R) Study tries to estimate repeatability and reproducibility components ofmeasurement system variation with primary objective of assessing whether gauge is suitablefor intended application or not. Measurement System Analysis (MSA) is a collection ofstatistical methods, which includes Gauge R&R Study, for analysis of measurementsystem capability. In this study, detailed literature review of MSA, Gauge R&R andMeasurement Systems Capability Studies, and general discussion of misclassificationprobabilities that give useful, reliable information about measurement systems performancewould be provided.