社會民主主義
Social democracy has some significant overlap on practical policy positions with democratic socialism, although they are usually distinguished from each other. While the now revised version of Clause IV to the British Labour Party Constitution which was implemented in the 1990s by the New Labour faction led by Tony Blair affirms a formal commitment to democratic socialism, describing it as a modernized form of social democracy, it no longer commits the party to public ownership of industry and in its place advocates "the enterprise of the market and the rigour of competition" along with "high quality public services either owned by the public or accountable to them". Many social democrats "refer to themselves as socialists or democratic socialists" and some such as Tony Blair "use or have used these terms interchangeably". Others argue that "there are clear differences between the three terms, and preferred to describe their own political beliefs by using the term 'social democracy' only".