Collect Data: Use a Likert Scale . A Likert scale is a data collection technique that was invented by American psychologist Rensis Likert in 1932. A Likert scale uses a rating system to measure attitudes, opinions, or perceptions where respondents choose from a range of possible positive and negative responses to a statement. . Usually a Likert scale will have an odd number of options so the whole scale is symmetrical. An example of possible responses on a common Likert scale is: Strongly Agree,