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	Test di Invarianza di Misura Multi-Gruppo	Funzionamento Differenziale dell'Item (DIF)
Campo	Psicometria	Psicometria
Famiglia	Latent structure	Latent structure
Anno di origine	1971–1993	1970s–1993
Ideatore	Jöreskog, K. G. (1971); Meredith, W. (1993)	William H. Angoff and colleagues (ETS); systematized by Holland & Wainer
Tipo	Model comparison / hypothesis testing	Item-level bias detection
Fonte seminale	Vandenberg, R. J. & Lance, C. E. (2000). A review and synthesis of the measurement invariance literature: Suggestions, practices, and recommendations for organizational research. Organizational Research Methods, 3(1), 4–70.	Holland, P. W. & Wainer, H. (Eds.) (1993). Differential Item Functioning. Lawrence Erlbaum Associates. ISBN: 978-0805809589
Alias	measurement invariance, factorial invariance, cross-group invariance, MI testing	DIF, item bias analysis, measurement non-equivalence, item-level measurement bias
Correlati	6	5
Sintesi	Multi-group measurement invariance testing examines whether a latent construct is measured in the same way across two or more distinct groups — such as cultures, genders, or age cohorts. It is a prerequisite for meaningful group comparisons of latent means or relationships, ensuring that observed score differences reflect true differences rather than measurement artifacts.	Differential item functioning identifies test or survey items that behave differently for examinees from different groups — such as gender, ethnicity, or language background — after controlling for the underlying ability or trait being measured. DIF analysis is essential for fairness evaluation in educational testing and psychological scale development.