Measurement properties of the system justification scale: A Rasch analysis

In the present study, we analyzed the measurement properties of the general version of the System Justification Scale in Italy using the Partial Credit Model with a sample of 544 youths (182 males, Mage = 17.47, SD = 1.59). The scale was unidimensional and showed acceptable measurement properties. However, its format should be reduced from seven to four categories. Moreover, the scale was able to discriminate people with intermediate system justification scores, while it did not discriminate those with extreme scores. Directions for future research are discussed in light of the present findings.