In sociology, an occupational closure (or professional demarcation) is the process whereby a trade or occupation (vocation) transforms itself, or tries to transform itself, into a true profession by closing off entry to the profession to all but those people who are suitably qualified, as defined by the practitioners already practicing the occupation in any given jurisdiction. This can be achieved by licensure (occupational licensing) and professional certification, barring entry to all except those who have passed certain entrance examinations and grades of training, or by allowing entry only to those who have gained membership of a specific professional body (a professional association, such as a particular medical society). It can also be achieved by trade unionism, and most especially craft unionism as contrasted with industrial unionism, in countries where sufficient union membership (as a percentage of workers in an occupation) can be achieved despite the prevailing gradient of union busting.
What this means in practical terms, is that an architect or physician, for example, will firstly be a university graduate in their main subject, second, will have passed entrance examinations to join a recognised professional body and thirdly, will also be licensed to practise medicine or architecture, usually also obtained through sitting examinations. Therefore, such professions are open only to those who satisfy these requirements and are closed to everyone else. It is thus illegal for any other person to practice medicine or to pose as an architect.
