By J Delarue
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5th International Multisensory Research Forum, Barcelona, Spain. Dijksterhuis, G. B. and Byrne, D. V. (2005). Does the mind reflect the mouth? Sensory profiling and the future. Critical Reviews in Food Science and Nutrition, 45, 527–34. , Ballay, S. -M. (2005). Flash profile and fragrance research: the world of perfume in the consumer’s words. ESOMAR Fragrance Research Conference, 15–17 May 2005 New York, NY. , Giboreau, A. and Nicod, H. (2004). Perceptive free sorting and verbalization tasks with naive subjects: an alternative to descriptive mappings.
How many consumers should be recruited for conducting a DA is a frequent question. Although not well defined, the most frequent panel size in published studies is of about 40–50 participants, but this may vary from one study to another, from 20 to several hundred. The appropriate sample size will probably depend on the objectives of the study. Obviously, the more consumers that are interviewed, the better the products will be statistically discriminated. The logic behind hedonic testing may apply.
Indeed, no method exists that is simultaneously accurate, discriminant and reproducible, that would give access to quantifiable data with possible translation into technical specifications, that is close to consumers’ perception and language, that would provide both hedonic and analytical data, that would be convenient, fast and cheap, and that would easily transfer to different countries and cultures. Sometimes, on the other hand, several methods might possibly fit the same objective. However, each method has its advantages and drawbacks.