OK - everyones gone chicken on me!! Try this then: Which qualifications do you hold and what did you have to do ie period of study and ie major recital, major thesis, teaching internship etc??? in order to get it?Dont be shy
Teaching has it's own set of skills and one must study pedagogy if one wants to systematically learn these skills. Or learn them by trail and error. Some of us come by teaching skills naturally, most of us have to work at it.
In the USA, there are only two certifications (that I'm aware of) which reflect teaching ability as measured through student success. They are the certification by the American College of Musicians which is awarded to teachers based on student accomplishment at annual Piano Guild Auditions, and the Well Prepared Pianist Institute which certifies teachers based on evaluation of student recitals. All of the other certifications are statements of teacher learning.