This chapter details the founding principles that can explain the drive towards central bank independence, and then looks at the consequences formal independence induces for the communication and understanding of monetary policy. The first part of the chapter examines the principles that have underpinned and stimulated the move towards independent central banks, and explains that these principles can be found in both the economic and legal domains. The second part examines how central banks deal with the accountability, transparency and disclosure requirements that flow from the independence principle itself. If central banks are independent, which constraints does this exerts on the need to communicate and explain monetary policy, to the markets and lay people.