Theoretical Foundations of Psychological Measurement Primary Source: Nunnally, J. C. (1978). Psychometric Theory (2nd ed.) / Nunnally, J. C., & Bernstein, I. H. (1994). Psychometric Theory (3rd ed.). Status: Definitive Academic Text
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For those interested in learning more about psychometric theory and Nunnally's work, there are several PDF resources available:
Nunnally's framework has shifted psychometrics from a purely descriptive field to a predictive and evaluative science. McGill University
: This refers to the consistency of a measure. Nunnally famously popularized the use of Cronbach’s Alpha as a primary tool for checking internal consistency—ensuring that all items in a test are pointing toward the same underlying construct.