Recertification of teachers, in other subject areas or for other grade levels, can become an important response to the oversupply of teachers in certain subject areas. By successfully completing a formal training program in a different subject area, teachers certified in one specialty can be licensed to teach in another, leading to the possibility of multicertification and a new concept of what a teacher ought to be. However, questions on the applicability and morality of recertification abound and must be addressed. If it becomes increasingly likely that teachers will be required to be competent in more than one discipline, a new look at what is known about the structure of subject matter and learning is required. Criteria for selecting teachers to be retrained should be considered, as well as the characteristics of retraining programs. In urban areas, recertification can help alleviate the "last hired" syndrome and provide answers for mid-career rejuvenation. Several arguments can be raised against recertification, such as the question of its effects on recruitment of new teachers and the principle of maintaining a natural supply and demand job market. (FG)