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Maintainability: The probability that a given maintenance action for an item under given usage conditions can be performed within a stated time interval when the maintenance is performed under stated conditions using stated procedures and resources. Maintainability has two categories: serviceability (the ease of conducting scheduled inspections and servicing) and repairability (the ease of restoring service after a failure).

Malcolm Baldrige National Quality Award (MBNQA): An award established by the U.S. Congress in 1987 to raise awareness of quality management and recognize U.S. companies that have implemented successful quality management systems. Two awards may be given annually in each of five categories: manufacturing company, service company, small business, education and healthcare. The award is named after the late Secretary of Commerce Malcolm Baldrige, a proponent of quality management. The U.S. Commerce Department's National Institute of Standards and Technology manages the award, and ASQ administers it.

Management review: A periodic meeting of management at which it reviews the status and effectiveness of the organization's quality management system.

Manager: An individual charged with the responsibility for managing resources and processes.

Mann-Whitney test: Mann-Whitney performs a hypothesis test of the equality of two population medians and calculates the corresponding point estimate and confidence interval. Use this test as a nonparametric alternative to the two-sample t-test.

Master Black Belt (MBB): Six Sigma or quality experts responsible for strategic implementations within the business. The Master Black Belt is qualified to teach other Six Sigma facilitators the methodologies, tools and applications in all functions and levels of the company and is a resource for utilizing statistical process control within processes.

Matrix: A planning tool for displaying the relationships among various data sets.

Mean: A measure of central tendency; the arithmetic average of all measurements in a data set.

Mean time between failures (MTBF): The average time interval between failures for repairable product for a defined unit of measure; for example, operating hours, cycles and miles.

Measurand: A particular quantity subject to measurement.

Measure: The criteria, metric or means to which a comparison is made with output.

Measurement: The act or process of quantitatively comparing results with requirements.

Measurement system: Measurement process description stating which components are included (apparatus, method, environmental conditions, (training of) operators), thereby which sources of measurement variation are present.

Measurement uncertainty (U): A parameter associated with the result of measurement that characterizes the dispersion of values that could reasonably be attributed to the measureand. (Uncertainty of Measurements)

Median: The middle number or center value of a set of data in which all the data are arranged in sequence.

Metric: A standard for measurement.

Metrology: The science of weights and measures or of measurement. A system of weights and measures.

MIL-Q-9858A: A military standard that describes quality program requirements.

MIL-STD-45662A: A military standard that describes the requirements for creating and maintaining a calibration system for measurement and test equipment.

MIL-STD-105E: A military standard that describes the sampling procedures and tables for inspection by attributes.

Mission: An organization's purpose.

Mission statement: Describes who an organization is and what it does.

Mistake proofing: See poka-yoke.

Mode: The value occurring most frequently in a data set.

Mood's median test: Mood's median test can be used to test the equality of medians from two or more populations and, like the Kruskal-Wallis Test, provides an nonparametric alternative to the one-way analysis of variance. Mood's median test is sometimes called a median test.

Muda: Japanese for waste. Any activity that consumes resources but creates no value for the customer.

Multi-vari analysis: A graphical technique for viewing multiple sources of process variation. Different sources of variation are categorized into families of related causes and quantified to reveal the largest causes.

Multivariate control chart: A control chart for evaluating the stability of a process in terms of the levels of two or more variables or characteristics.

Myers-Briggs type indicator (MBTI): A methodology and an instrument for identifying an individual's personality type based on Carl Jung's theory of personality preferences.

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