Compare methods

	System Justification Scale	Social Dominance Orientation Scale
Field	Political Psychology	Social Psychology
Family	Process / pipeline	Process / pipeline
Year of origin	1994	1994
Originator	John T. Jost & Mahzarin R. Banaji	Felicia Pratto, Jim Sidanius, Lisa Stallworth, and Bertram Malle
Type	Self-report attitude scale	Self-report Likert scale
Seminal source	Jost, J. T., & Banaji, M. R. (1994). The role of stereotyping in system-justification and the production of false consciousness. British Journal of Social Psychology, 33(1), 1-27.	Pratto, F., Sidanius, J., Stallworth, L. M., & Malle, B. F. (1994). Social Dominance Orientation: A personality variable predicting social and political attitudes. Journal of Personality and Social Psychology, 67(4), 741–763.
Aliases	SJS, General System Justification Scale, Economic System Justification Scale	SDO
Related	4	4
Summary	The System Justification Scale operationalizes system justification theory, introduced by Jost and Banaji (1994), which holds that people are motivated to defend, bolster, and rationalize the existing social, economic, and political status quo, even when doing so runs against their personal or group interest. The general version, refined by Kay and Jost (2003), is an 8-item self-report measure on which respondents rate agreement with statements such as 'In general, the American political system operates as it should' on a 7- or 9-point Likert scale.	The Social Dominance Orientation Scale (SDO) is a self-report measure developed by Pratto, Sidanius, Stallworth, and Malle in 1994 to assess individual differences in preference for group-based hierarchy and inequality. The scale measures the extent to which individuals support dominance of some groups over others, reject egalitarianism, and accept hierarchical social organization. It has become central to social dominance theory and is widely used in political psychology and intergroup relations research.