The construction of grading schemes based on freshness assessment of fish

Summary Standard acceptance sampling schemes can be modified for use in grading, where grades are defined by one or two boundaries and a percentage permitted to fall below the lower boundary. Schemes are constructed to grade fish by freshness, using sampling by attributes or by variables, where the method of assessment is Raw Odour. When another method of testing, such as the Torry Fish Freshness Meter, is used, it is not sufficient in the attributes scheme to convert to new grade boundaries; the corresponding percentages falling below the grade boundaries for the new test must be determined. The procedures for deriving a scheme are not restricted to grading offish, but may be applied to any similar quality control situation.