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Extra info for The Role of Sensory Analysis in Quality Control (Astm Manual Series)
For example, to save time, an end product might be evaluated METHODS 33 SMOOTHNESS 2 3 4 5 6 7 8 SAMPLE FIG. 1—Smoothness testing over ten batches. cold by the QC staff instead of heating it as the customer would be likely to do. Perception of volatile materials will change depending on the temperature, and the time saved by not preparing samples uniformly and correctly is not worth the possibiUty of obtaining inaccurate results. Example 2: Difference Testing Company B manufactures candy. Their caramel candy is made with a special cooking process that produces a flavor that sets it apart from the competition.
For example, the company might be manufacturing an economy grade product such as an inexpensive wine. " The important differentiating characteristics should then be listed, along with relative intensities. These characteristics, while not necessarily representative of the finest wines, are what the customers expect when they purchase the product. These are the characteristics that should be used in maintaining the target sample. Maintaining differentiating characteristics and keeping a record of the extent to which they are maintained can be helpful in answering marketing questions.
The results of difference from control/degree of difference testing can be graphically presented. These tests are all based on a reference standard. The degree of difference test differs from difference from control tests in that variance as a result of judge (as measured by reference versus blind-coded reference) is averaged with variance as a result of batch or lot of product. Variation as a result of batch is measured by testing the reference versus a blindcoded second sample from a different batch or lot.