Medical doctors, pharmacists, nurses, jurists and certified public accountants are among the professionals who have had to pass national licensing examinations to get started. As professionals, they must have specialized knowledge and skills.
To become an elementary, middle or high school teacher, one must obtain a teaching license by studying required subjects at a university and undergoing practice teaching. Of late, there have been increasing calls for a mandatory system of periodic license renewal to prevent teachers' skills from deteriorating. Proponents say license renewal would help teachers maintain their aptitudes and improve their expertise.
Teaching aptitude primarily depends on one's personality. It should be tested when one applies for a license. If a teacher's aptitude was not evaluated by a school principal or parents until five years after he or she obtained a license, irrecoverable damage could be done to students during the period if the teacher was inept.