This chapter discusses the general provisions of the citizens’ Directive (Articles 1–3), which state its purpose and define its territorial and personal scope. Essentially, the Directive applies to EU citizens and their family members who move to another Member State. While the basic tenets of the Directive can be described quite simply—EU citizens have the right to move to another Member State and to bring their family members with them—the detailed interpretation of the key rules defining the scope of that simple tenet has proven increasingly complex and controversial. The chapter then addresses three issues—the definition of EU citizens, the requirement of movement between Member States, and the position of family members—that determine the application of the rest of the Directive, and so delineate exactly which persons have the right to enter and reside, enter the labour market, resist expulsion, claim social benefits, and obtain permanent residence status.