Table 1.

Glossary of terms used in this article.

Acceptability	A favorable “attitude” towards a product, predisposing a person to be willing to use it. In the context of choice, acceptability may be measured as the selection of one product or behavior over another or the continued use of the product over time.
Adherence	A behavioral construct related to the extent to which a product is used as intended. Dimensions of adherence include timing of product use, dosage taken, consistency and duration of use.
Conjoint analysis	A statistical technique used in market research to determine how people value different features that make up an individual product or service.
Discrete choice experiment	A statistical technique in which individuals state their preference for one product scenario among a set of realistic scenarios in order to understand consumer choice.
Perceptibilty research	Research approach, with methods similar to those in sensory evaluation science, aimed at better understanding and measuring users' sensory perceptions and experiences of products in order to inform product design and formulation.
Psychometric scale	Sets of survey items in the form of statements that, when combined, measure a more complex construct that may not be directly observable.
Rheology	A science dealing with the deformation and flow of matter.
Qualitative Research	Research approach that favors collection of textual or other non-numeric data and aims to gather an in-depth understanding of human behavior. The approach can be especially effective in obtaining culturally specific information about the values, opinions, behaviors, and social contexts of particular populations.