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# What are the individual metrics used for ISO/IEC 15416?

Below is a list of the metrics calculated for ISO/IEC 15416 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.

- Decodability is the measure of bar code printing accuracy in relation to the symbology-specific reference decode algorithm. Decodability indicates the scale of error in the width of the most deviant element in the symbol. The smaller the deviation, the higher the grade.

- Defects are irregularities in elements (bars and spaces) and quiet zones. The parameter is used to measure the ‘noise’ that results from unwanted dips and spikes in the Scan Reflectance Profile. The smaller the defect, the better the grade.

- Edge Contrast Minimum is the lowest difference between bar reflectance and space reflectance of two adjacent elements, which gives an indication of edges sharpness. The greater the difference, the higher the grade.

- Reflectance Minimum is the lowest reflectance value in the scan, a measure of the darkest part of the barcode. The lower this value, the higher the grade.

- 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.

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

- Reference Decode is an indication of whether the standard 2D Data Matrix algorithm was able to locate and decode this particular mark.

  This metric generates a grade of either A or F .

- Edge Determination is the number of edges detected in the Scan Reflectance Profile. If the number of detected edges is greater than or equal to the expected number of edges, the grade is 4. Otherwise, the grade is 0.

Note: DM050, DM060, DM070, DM080, DM150, DM260, DM280, DM290, DM300, DM360, DM370, DM380, DM390, DM470, DM503, DM580, MX-1000, MX-1500