Who is credited with being the originator of the psychometric concept of test reliability?

Name: Who is credited with being the originator of the psychometric concept of test reliability?
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Spearman is credited with being the originator of the psychometric concept of test reliability. He introduced the concept of test reliability in the context of intelligence testing, emphasizing the importance of consistent results across different administrations of the same test.

Who Is Credited with Being the Originator of the Psychometric