So close, yet so far - a methodological investigation of the potential of and optimal sample sizes for the application of napping as rapid sensory method

This paper introduces a large-scale Napping study, serving the purpose of identifying the optimal sample size for a scientific employment of Napping in marketing contexts. A napping with 15 yogurt samples (n = 104) for the properties appearance, taste and texture was arranged. For the evaluation of the napping data, random samples were evaluated using MFA and GPA. Tucker´s congruence coefficient (rc) was used to interprete the results. In contrast to current standards recommending sample sizes of 9-15 respondents, our results suggest Napping sample sizes of at least 20, ideally 33 untrained subjects in order to get statistically sound results.