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	Sviluppo di scale ordinali	Analisi di Affidabilità Ordinale
Campo	Psicometria	Psicometria
Famiglia	Latent structure	Latent structure
Anno di origine	1932 (Likert format); 1990s–2000s (ordinal-specific psychometric methods)	2007
Ideatore	Rensis Likert (foundational ordinal response format); modern ordinal methodology codified by DeVellis and Finney & DiStefano	Bruno D. Zumbo and colleagues
Tipo	Scale construction methodology	Internal consistency reliability estimation
Fonte seminale	DeVellis, R. F. (2017). Scale Development: Theory and Applications (4th ed.). SAGE Publications. ISBN: 978-1506341569	Zumbo, B. D., Gadermann, A. M. & Zeisser, C. (2007). Ordinal versions of coefficients alpha and theta as measures of internal consistency for Likert rating scales. Journal of Modern Applied Statistical Methods, 6(1), 21–29.
Alias	Likert scale development, ordinal measurement scale construction, ordinal item development, polytomous scale construction	ordinal alpha, polychoric reliability, reliability for ordinal scales, ORA
Correlati	5	5
Sintesi	Ordinal scale development is the systematic construction and validation of multi-item measurement instruments whose response options form an ordered but not necessarily equal-interval sequence — most commonly Likert-type formats (e.g., 1 = Strongly Disagree to 5 = Strongly Agree). It applies psychometric techniques that respect the ordinal nature of items rather than treating them as continuous.	Ordinal reliability analysis estimates the internal consistency of scales whose items are measured on ordered-category (Likert-type) response formats. By basing computations on polychoric correlations rather than Pearson correlations, it corrects for the attenuation that standard Cronbach's alpha produces when responses are discrete and non-normal.