Rolling temporary contract enable school managers to check references of teachers' performances in a variety of classrooms. That would be a far better approach to giving permanent jobs than relying on academic credentials.It is entirely possible that this is the case. Any teacher on here will suggest such. Often those with the strongest academic pedigree have the most difficulty in teaching as their expectations are so wildly off that they end up overestimating the capacity of a given student to learn effectively. It can lead to students busying themselves in other ways.
It's also just impossible to judge accurately which is why Unions would oppose such thick policies.
That and the teacher can simply beef up their numbers in order to give the impression that it's all going smoothly.
Which will lead, as it already has in most Irish schools which maintain a good degree of autonomy over hiring, a revolving door, jobs-for-the-boys approach. In my old secondary school the Irish teacher was the son of the previous principal and the history teacher the son of the former history teacher. The history teacher was superb, the Irish teacher couldn't speak Irish.
You're a fool. You know why? You are a fool because you are treating students in these schools as empirical data that can be easily modified by the right engineer.
Human beings are complex enough but teaching children is more complex again. Human interactions are notoriously difficult to quantify yet here you are swinging the cudgel of truth as if things were that simple.
You could have a teacher who excels in every field possible who encounters a class that, for whatever reason, he cannot communicate effectively with and whose results suffer as a result. There is no one-shoe-fits-all approach to teaching.
Your answer - to funnel prospective teachers into precarious employment under the blatant lie that you have the child's interests at heart - is the most bafflingly stupid proposal possible. Only some clown who has never worked a rolling, temporary contract - which exposes you to all sorts of issues financially - would suggest such an approach.
Students need above all stability. They require their teachers to be in the best possible form in order to perform at a required level. The Brits are trying this genius Malthusian policy of education and their standards have fallen through the floor. Supply teachers being contracted out like Uber drivers (another vile entreprise) to teach classes with whom they'll never develop a meaningful relationship.
People are not figures. They never will be. You should approach problems like this with consideration for that.
While temping is financially insecure, it is necessary for informed teacher recruitment.
Some school managers will play favourites in recruitment. It is up to the school boards to prevent that by removing managers for cronyism. It should be apparent to informed parents if there is cronyism and they should move their children to another school.