Teaching has never been on solid footing as a profession. A professional is a recognized expert, an authority within a particular field. Any field that attains professional status needs at least these three ingredients: specialized knowledge and skills; specialized training; and a system of formal certification, marking mastery of the skill set, completion of the training, and membership in the profession. Without these three ingredients, the professional’s expertise would have no recognizable validity; she would be indistinguishable from a snake-oil salesman. (There are other characteristics of professions that grow naturally out of these three, but these are the essential ingredients.)
Teaching has, for about a hundred years, possessed at least the semblance of all three elements—but only the semblance. There are tests required for teacher certification, but the tests are extremely easy; most well-educated non-teachers could pass them. There is training, but the curriculum and content vary wildly from one training program to another; so, though it may be specialized, it is not specialized in any particular way. The training is also brief, often undemanding, and of dubious practical value to teachers; and you don’t actually need to complete it to begin teaching. Teaching—or good teaching, at least—requires plenty of specialized skills and knowledge, but there’s not much agreement as to what those skills and knowledge are, and no one actually thinks that all or even most teachers possess them.
