Compare methods

	Political Knowledge Scale	Political Ideology Scale
Field	Political Psychology	Political Psychology
Family	Process / pipeline	Process / pipeline
Year of origin	1993	1990
Originator	Michael Delli Carpini & Scott Keeter	Hans-Dieter Klingemann & Norberto Bobbio
Type	Factual knowledge battery	Self-report
Seminal source	Delli Carpini, M. X., & Keeter, S. (1993). Measuring political knowledge: Putting first things first. American Journal of Political Science, 37(4), 1179-1206.	Fuchs, D., & Klingemann, H. D. (1990). The left-right schema. In M. Kent Jennings & Jan W. Van Deth (Eds.), Continuities in political action. Berlin: De Gruyter.
Aliases	Civic Knowledge Battery, Factual Political Knowledge Index, Delli Carpini-Keeter Knowledge Items	Left-Right Scale, Ideology Continuum, Political Spectrum Scale
Related	4	3
Summary	The Political Knowledge Scale measures the range of factual information about politics that citizens hold and can retrieve, operationalized as a battery of factual quiz items. Delli Carpini and Keeter (1993, 1996) established the canonical short batteries (often five items) and argued that general political knowledge, not domain-specific information, is the most useful and reliable construct for survey research.	The Political Ideology Scale measures individual self-placement on a left-right political spectrum, capturing fundamental preferences for government role, economic organization, and social values. The single-item self-placement measure (most common) asks respondents to rate themselves on a 0-10 or 0-100 continuum; multi-item versions assess distinct ideological dimensions (economic policy, social policy, nationalism). The left-right axis remains the dominant organizing principle of political competition globally, predicting party choice, policy preferences, and electoral behavior despite critiques that it oversimplifies multidimensional political space.