A great deal of comparative education research has focused on systems of education. Sometimes, however, this focus has been
implicit rather than explicit, and the units of analysis have not always been clearly defined. This chapter begins by noting
some prominent examples in which scholars have focused – or claimed to have focused – on systems of education. It then discusses
methodological issues relating to the use of education systems as a unit of analysis in comparative research. It notes that
some countries have multiple systems of education, and thus that research which focuses on systems can be intranational as
well as cross-national.