What do Likert's method of summated ratings,Guttman's scale and Thurstone's method of equal-appearing intervals have in common?

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All three methods are based on the assumption that attitudes can be measured quantitatively. Likert's method of summated ratings involves respondents rating their level of agreement or disagreement with a series of statements, which are then summed to create an overall score. Guttman's scale involves a series of increasingly specific statements that are intended to be hierarchically related, with respondents indicating which of the statements they agree with. Thurstone's method of equal-appearing intervals involves presenting respondents with a series of statements and asking them to indicate how much they agree or disagree on a scale that has been divided into equal intervals.

What Do Likert's Method of Summated Ratings,Guttman's Scale and Thurstone's