TLDR; Often the process of modelling is more important than the models, we carry forward what we learn rather than remodel consistently. I was looking through old folders of notes to feed to the shredder and paused to comment on some graphical models prior to the shred. Over the years I’ve kept too many old notes and it is now shredding time. Photos of Scraps As I worked through a “Test Modelling” folder I found a scrap of paper with the following diagrams: Code focused testing: System ...