Measuring productivity of teachers in the public education sector?

I hope I’m posting to the right sub. I believe this might be an economics question regarding education, so here it is!

I have a business idea and I believe my starting point for the requisite research needed to launch lies in figuring out how to accurately measure the productivity of secondary school teachers. More specifically, an individual secondary school teacher. (Later, I want to do the same thing for secondary school administration staff such as principals, vice-principals, receptionists, etc., but I digress.)

The problem is, I’m not entirely sure how to accurately get this measurement.

Typically, a productive employee is an “excellent” employee that pulls his/her weight and, most of the time, much of the weight of other employees.

However, what makes an objectively excellent (productive) teacher?

I’ve simplified it to find an output, measure the output across time (probably a teaching year), find an input, divide the output by the input, and finally do some sort of factor analysis.

Would anyone be able to point me in the right direction to find these variables such as a good output and a good input? Also, if you have a sense I’m going in the wrong direction, feel free to let me know!

Thanks in advance!

Submitted February 06, 2019 at 06:21PM by jphus http://bit.ly/2Ged9mE