The study explored the sources of political knowledge using data from the 1984 Canadian National Election Study. Two dimensions of political knowledge were measured: factual knowledge, in which respondents were asked to name the 10 provincial premiers; and conceptual knowledge, in terms of respondents’ abilities to define and use the concepts of left and right. The authors tested four explanations of people's levels of political knowledge; these dealt with education, political participation, media effects and region, with controls for income, residency in several provinces, age and sex. Education was significantly associated with both forms of knowledge, but especially with conceptual knowledge. Reading about politics in newspapers and magazines was strongly related to the two knowledge variables. The effects of reliance on television for political information, however, were much weaker. There were significant effects for region, with the patterns depending on the type of knowledge. The study concludes with some observations about the role of knowledge in political behaviour.