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TIMSS 2019 is the first assessment in the TIMSS transition to a computer-based assessment system, called eTIMSS. The TIMSS 2019 Item Equivalence Study was conducted in advance of the field test in 2017 to examine the potential for mode effects on the psychometric behavior of the TIMSS mathematics and science trend items induced by the change to computer-based administration.

The TIMSS 2019 Item Equivalence Study: examining mode effects for computer-based assessment and implications for measuring trends