Following the detailed analysis at the level of the individual parties, this chapter focuses on the comparative dimension. At the core of this study is the idea of the party family, a distinct group of parties with a shared core ideology. This chapter notes the similarities of the ideologies of the five parties, albeit in a manner which remains conscious of key differences. As of yet, the research on political parties in general and party families in particular that has been conducted on the basis of an ideological approach has been very limited in both range and quantity. The categorisation of political parties according to broader families has now become a more or less standard procedure in the numerous crossnational studies of political parties, and distinctions between party families have thereby become fundamental elements in studies in such diverse subfields as coalition formation.