Traditional methods of consumer tests have been applied to the testing of personal care products since many years. Difference and descriptive tests on odours, perfumes, textures, cosmetics tolerance, or efficacy generate subjective information that is very useful to the formulators, R&D managers, marketing, and regulatory affairs team. Untrained panels with experienced uses of personal care are known to be capable of detecting differences of various skin, hair, or nail products attributes under controlled laboratory conditions or in a home use situation after a single use or a treatment.