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Water quality. Requirements for the comparison of the relative recovery of microorganisms by two quantitative methods Ingestion-build-63436 iris image and signature/sign behavioural1 Scope This International Standard specifies an evaluation procedure for comparing two methods with established performance characteristics according to ISO TR 13843 and intended for the quantification of the same target group or species of microorganisms. This International Standard provides the mathematical basis for the evaluation of the average relative performance of two quantitative methods against chosen criteria for the comparison. It does