Apart from the worker directors, and members of the Railway Procurement Agency, where a specific skills mix is identified under the legislation governing the body, there is no specific formula governing the choice of appointees to State boards. Of necessity, the choice made involves a question of judgment. The foregoing sets out in broad, yet reasonably accurate, terms the mix of considerations which are taken into account when a vacancy arises on a State board and a decision is required in relation to the filling of that vacancy. It is also relevant that discussions may be involved between the Minister and the chairman of a particular State body before decisions are made to fill vacancies that arise on the board of such a body.