Quality Evaluation by Numerical and Subjective Methods, with Application to Dried Veneer

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Abstract
The quality after experimental drying of 1/16 in. thick Eucalyptus gigantea veneer was evaluated by three observers, using a numerical and a subjective scheme. Both methods employed continuous linear scoring scales for the assessment of types of defects and over-all quality. In the numerical method, quality ratings were obtained by summing weighted measurements of defects, whereas in the subjective scheme they were obtained by mental integration of visual observations. Analyses of variance of the results indicated that although the numerical scheme had no intrinsic advantage, it was slightly more accurate than the subjective scheme. For many applications, the difference in accuracy is more than compensated by the much shorter time required to apply the subjective scheme, and by its greater simplicity. The observer component of variance was non-significant in both schemes, but since a sheet-observer interaction existed it would be more efficient to increase accuracy by employing more observers rather than by increasing the number of observations per observer.

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