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Systematic training and full knowledge of food properties are basic requirements for panelists asked to test products by descriptive analysis. In some cases routine quality control is carried out prior to marketing by a less experienced peripheral panel at the plant, with a trained pool at the central laboratory performing occasional checking of the same product.

The letter presents the results of a test conducted on the CCIR worst-month prediction method to assess its performance and, if convenient, to update its parameters. Results indicate an RMS error of some 24% and that, with the present data, updating the model parameters would only produce a marginal improvement