I believe that one of the most important problems created by trying to boil teaching down to a checklist of non-negotiables is the lethal mutations that are likely to follow.
When we say that every teacher, in every lesson, must do X, Y, and Z, we strip away the principle-based component of teaching and turn it into a playlist: Do A, then B, then C, in this order, every day, and students will learn. Obviously, that’s not how learning works.
Take retrieval practice, for example. If we say every teacher must begin every class with retrieval practice, or every teacher must end every lesson with an exit ticket, or every lesson must include explicit modeling, we inevitably start trying to fit square pegs into round holes. Practices that can be powerful when used purposefully, appropriately, and in alignment with the principles behind them become mutated versions of themselves.
Eventually, the practice can become so divorced from the conditions and principles that made it effective in the first place that we are still technically “doing” the strategy, but we are no longer doing the thing the evidence actually supports.
The goal shouldn’t be to create a universal playlist of practices for teachers to execute. It should be to understand the principles that make those practices effective, and then give teachers the knowledge and judgment to determine when, why, and how to use them.