Some teachers are better than others and for the main part this is innate: it is not learned and never can be. The only measurement is the quality of students that are lucky enough to be taught by them. Even then, tying down the factors that do improve matters is not easy to identify. Usually. students have an affinity with a teacher; thus they are prepared to work harder. It is not the teacher who is putting in more effort - it is the student. Testing students to deduce the performance of their teachers will also drive a wedge between teachers and students. Considering only one in ten teachers will benefit from the bonus scheme it is divisive for teachers themselves. Industrial strife is just down the road.
Overall, it is a silly exercise. Why should the Government, the taxpayer, pay more? Will good teachers be paid more for what they are already doing? It seems so. Why single out one sector of employment for a reward that everyone else doesn't get purely because it is motivated by one person, Julia Gillard? Apparently it has to do with good teachers being virtuous people. It is not much use holding out one group as an example if there is no intention to apply it to the whole workforce. Paying good teacher more will not make lesser beings respectful toward them. It will make the average teacher angry. Let's not go back to pet projects like in the Howard and Rudd eras.