This International Standard - specifies the methodology for the measurement of specific attributes of bar code symbols;- defines a method for evaluating these measurements and deriving anoverall assessment of symbol quality;- gives information on possible causes of deviatio from optimum grades to assit users in taking appropriate corrective action.This International Standard applies to those symbologies for which a reference decode algorithm has been defined, and which are intended to be read using linear scanning methods, but its methodology can be applied partially or wholly to other symbologies.