AAOM Handbook

Leading Measure

A leading measure is one where a change in the measure occurs at some time interval before the result of that change will be evident a related lagging measure.

The measures of the Theory of a process often significantly lead the measures of the Purpose (output) of the process.

Limiting Value

The constant defined for calculating the value of each output measure when that measure is expressed as the ratio of a variable and a constant. For example, for Utilisation and Availability measures the limiting value is 24/7 time. For rate measures it is the 95 th percentile of the measured performance histogram for a process as it is currently designed.

Losses

The difference between the measured performance at a sampling point and the limiting value defined for that measure for the process.

Pareto Chart

A type of chart that contains both bars and, generally, a line graph. Categories of data are represented by the bars, the height of the bars (presented in descending order) indicate the value of the category, and the cumulative total of the category values is represented by the line. It is used to illustrate the relative contribution of different categories to a total result.

Primary Cause

The cause of performance loss observed at a Sampling Interval that is identified as the primary cause of the loss. That is, in the hierarchy of losses this cause has the highest placing.

There can be only one primary cause for the loss at any sampling interval.

Sampling Interval

The interval at which values are sampled when measuring a parameter.

Sampling Period

The interval over which data is collected in order provide to a representative sample of performance.

© McAlear Management Consultants 2004

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