Ando truly nailed the 1 in 5 nonsense being brandished about by the minister, but what is the reality of a bell curve, what does it actually mean.
To me you can look at it from another viewpoint. A bell curve indicates that there is always someone struggling or failing. So I ask the question, is it me or you? It isn't plausible that we are so far down in the intelligence scale that we are failing because of intellect. BUT it is probable that teachers/principals are failing in the actual skills and delivery to work in the classroom and staffroom. I reckon 1 in 10 might be a decent guesstimate. Look around your colleagues the next time you meet, 1 in ten eh? But before pre judging anyone look at yourself.
I found the last four days at Masterclass Paramatta one of the best reflective opportunities. It had nothing to do with the format, more the people, surroundings and time. I was able to look at my own performance and realize that confidence can lead to a false sense of accomplishment and a dip in knowledge. When you are totally confident in where you are going without always looking to improve and learn more you can build up a false sense of achievement.
When you apply this to teachers think about the things you don't know, think about your blindspot in the Johari window. What do others know about you that you don't know? What do you know about your performance that no one else knows?
Sometimes this is the wake up call you need to give yourself. I'm not talking about those rubbish teachers, or those who destroy your school culture (they have to go) I'm talking about good people just looking to keep pressing the envelope.
Pull out the Johari window, trial it with your friends, look from another person point of view, it works.