A Likert scale (/ˈlɪk.ərt/ LIK-ərt but more commonly pronounced /ˈlaɪ.kərt/ LY-kərt) is a psychometric scale commonly involved in research that employs questionnaires. It is the most widely used approach to scaling responses in survey research, such that the term is often used interchangeably with rating scale, or more accurately the Likert-type scale, even though the two are not synonymous.