TeachMeet Failure?

Of course it is a truth universally acknowledged that an Assistant Head who has had a 'good idea' is usually to be avoided at all costs, or at least pointed in a direction where the pursuit of said idea doesn't cause too much disruption to everybody else in school who is trying to get on with their job. With this in mind, I'm slightly dismayed to announce that I think I've had one. Or at least stolen one. I've been reading a couple of books on how professionals and organisations learn and improve, notably Adapt by 'Undercover Economist' Tim Harford and Practice Perfect by Doug Lemov. Harford argues that the most effective model of prompting positive change in organisations lies in a sort of replication of natural selection. He describes a constant cycle of trying out lots and lots of new ideas, getting good feedback and then selecting and going with the few among them that work. Google is a good example, with their policy of giving staff twenty percent...