The vast majority of Michigan teachers are rated as effective or highly effective. The latest numbers posted by the Michigan Department of Education are from the 2012-2013 school year. They show that 97% of teachers were rated as effective or highly effective. (Look here for details. For the percentage click on the "percentage" tab.)
How many doctors are rated effective or highly effective?
I don't know. I can't find on the state of Michigan's website a list anywhere that rates doctors.
My guess is that most doctors - probably over 90% - would be rated effective or highly effective.
Yet, there are a lot of people who are obese. There are a lot of people who don't exercise. There are a lot of people who have high blood pressure. There are a lot of people who do not engage in a healthy lifestyle.
Still - most doctors would be rated as effective or highly effective.
But we don't know. Because the state of Michigan does not publish a list that rates doctors.
How many Certified Public Accountants are rated effective or highly effective? Or financial planners? Or dieticians? Or legislators?
My guess is that in most professions the vast majority of professionals are rated effective or highly effective. After all most professionals have college degrees, have lots of experience, and participate in ongoing training.
Yet, there are a lot of people whose finances are in trouble or who can't plan a meal or who can't legislate. But do we blame the accountants or the financial planners or the dieticians or the politicians?
We also don't know because the state of Michigan does not provide a rating list of CPA's or financial planners or dieticians or legislators.
Are there bad teachers and administrators?
Should bad teachers and administrators be evaluated out of their profession?
Historically, education has done a bad job of evaluating educators.
But, I would argue, that most professions have done a bad job of evaluating themselves.
That does not excuse the historically poor job educators have done in rating teachers and administrators. Rating educators is important. Teachers and administrators work with children and have a tremendous influence on their lives.
We must get educator evaluation right. But just because most end up being rated as effective does not mean the system is broken.