The institutions of the state follow an informal and uncodified tradition known as a constitutional convention. They are the rules of good political behaviour. Conventions are constitutional provisions that are not upheld by the courts.
They are best viewed as non-legal principles because the law courts do not enforce them, but because they do, in reality, control how the constitution operates, they are a key area of interest for constitutional lawyers. Conventions set forth the procedures to be followed while exercising legal authority.