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# What are the individual metrics used for ISO/IEC 15415?

Below is a list of the metrics used for ISO/IEC 15415 quality assessment. For more detailed information on this code quality standard and its metrics, see the DataMan Communications and Programming Guide or the corresponding ISO standard documentation, which can be found at www.iso.org.

- Grid Non-Uniformity is a measurement for the amount of placement error for the individual cells from a uniformly spaced grid as measured using the clocking pattern of a symbol.

- Unused Error Correction is a measurement for the percentage of code words left in a symbol after correcting for any errors.

  When calculating Unused Error Correction, a code word is considered to be in error if at least one of its cells is on the wrong side of the global threshold. 2D Data Matrix symbols have built-in code redundancy, or the presence of duplicate data content.

  A value of 1.00 means no errors were present in any of the code words.

- Axial Non-Uniformity is a measurement of the symmetry of individual cells within the symbol, that is, the amount of deviation along the symbol's axes.

- Symbol Contrast is the difference between the highest and lowest reflectance values in a scan (the difference in reflectance between the darkest bar and the lightest space). The grade is higher with a greater the difference

- Extreme Reflectance is a yes/no value indicating if the substrate surrounding the symbol contains reflectance extremes that can interfere with reading.

- Fixed Pattern Damage is the quality of the finder, clocking, and quiet zone patterns within the mark.

  The reader uses several patterns within each symbol to locate and decode the data it contains. The reader generates the Fixed Pattern Damage grade using the same method as the Cell Modulation score, specifically a measurement of reflectance confidence.

- Modulation is the ratio of Edge Contrast Minimum to Symbol Contrast, or, a measure of how a scanner sees wide elements (bars or spaces) relative to narrow elements. The greater the difference between Edge Contrast Minimum and Symbol Contrast, the lower the grade.

- Print Growth measures the deviation of bar and space width from the intended widths (indicated in the symbology specification), that is, it measures if bars are narrower/wider compared to spaces in the symbol. The higher the difference, the lower the grade.

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