from a same-age (linear) system to a multi-age, non-linear system needs considerable reflection and care. It is easy to make big mistakes. You cannot use the hand-me-down thinking behind the existing horizontal systems to create a vertical system. So much is counterintuitive and has to be unlearned. There are many schools that have ignored training and have had to revert back to their old model. This is simply poor leadership not a system fault.
This short video is about change and is sometimes used in training, It deals with the 'why' but not the 'how'. That's why external guidance is important.
This is how Robin Cox, N.Z based educator, describes the importance of the multi-age tutor system. Simply press the button
Below is a link about VT and good mental health. Please highlight the text, press right button and 'go to'