Aircraft Profile No. 38: The Fokker Monoplanes by J. M. Bruce

By J. M. Bruce

Moment Library reproduction. San Diego Air and area Museum.

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Extra resources for Aircraft Profile No. 38: The Fokker Monoplanes

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Lf the outcome of a sensory test is perfectly known and predictable, there is no need to conduct the formal evaluation. Unfortunately, useless tests are often requested of a sensory testing group in the industrial setting. The burden of useless routine tests arises from overly entrenched product development sequences, corporate traditions, or merely the desire to protect oneself from blame in the case of unexpected failures. However, the sensory test is only as useful as the amount of reduction in uncertainty that occurs.

Meiseiman pointed to the Iack of focused methodological research aimed at such issues of measurement quality as reliability, sensitivity, and validity. Many sensory techniques originale from needs for practical problern solving. The methods have matured to the status of standard practice on the basis of their in- 20 SENSDRY EVALUATION OF Foon: PRINCIPLES AND PRACTICES dustrial track record, rather than a connection to empirical data that compare different methods. The increased rate of experimental publications devoted to purely methodological comparisons in journals such as the Journal oj Sensory Studies and Food Quality and Prt([erence certainly points to improvement in the knowledge base about sensory testing, but much remains to be done.

The method of Iimits could be used to determine absolute thresholds; the method of constant stimuli used to determine difference thresholds; and the method of adjustment used to establish sensory equivalence. In the method of Iimits, the physical stimulus is changed by successive discrete steps until a change in response is noted. ' Over many trials, the average point of change can be taken as the person's absolute threshold. This is the minimum intensity required for detection of the stimulus.

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