The use of summated in the name implies that multiple items will be combined or summed. Second, each individual item must measure something that has an underlying, quantitative measurement continuum. In other words, it measures a property of something that can vary quantitatively rather than qualitatively.

What is summated Likert scale?

Summated scales (or Likert-type scales) are developed by utilizing the item analysis approach wherein a particular item is evaluated on the basis of how well it discriminates between those persons whose total score is high and those whose score is low. ... For this reason they are often referred to as Likert-type scales.

What is summated rating method?

The response values for individual items may be summed to obtain a total or average score that reflects a person's general attitude toward the construct of interest. A Likert scale is the most commonly used summated rating scale. Also called summated rating method; summated scale.