This discriminatory testing method is often used as a tool in quality assurance programs to insure that samples from different production lots are against yours. Triangle tests are also used in product development studies to determine if various ingredient substitutions or changes in processes will rresult in adverse product effects. This method is similar to the triangle tests, however fewer samples are required and there is less tatting. The statistical efficiency is not, however , as great with the paired- comparison as it is with triangle test. However , no indication of the magnitude of difference between samples is obtained because samples are only evaluated in relationship to each other.
Descriptive analysis requires at least three evaluative processes.
The steps of discrimination and description of traits are qualitative. The language used is developed through careful training an d practice with the panel. This requires panelists to develop a common vocabulary which catalogues various sensory stimuli with appropriate language. Descriptive analysis is a complex cognitive process which requires more mental acuity than sharp taste or olfactory senses. Discrimination among stimuli is only part of the qualitative process.