The Iyengar Certification process with the Iyengar Yoga National Association of the United States (IYNAUS) is very rigorous, assuring you of a teacher well trained in the art of teaching yoga. The Certification Mark is used exclusively by Certified Iyengar Yoga Instructors throughout the world as an international symbol of the highest standards of excellence in training and continuing education in the Iyengar method.
Here is a synopsis of the Certification program. After years as a student of yoga and with significant early teaching experience, candidates for assessment apply to take the exam. Given over the course of a weekend, propsective teachers must show proficiency in performance of the asanas or postures at their level and take a written exam on philosophy, anatomy, and practical knowledge of teaching. In the third and most important part of the test, the candidate is observed and assessed while teaching a sample class.
This process is repeated in a year or two with a different set of poses and only then is the full certification granted at the Introductory level. There are six levels currently available for assessement, from introductory to intermediate senior. Higher levels have been granted directly from Shri B.K.S. Iyengar.
After successful completion of this exam, the teacher is considered certified and may denote that with the official Certification Mark.