@JohnSmall I agree that there is a lot of differences and certainly lots of places where scope is not included in the function calls for queries. There is a lot of work to bring it up to date from B0.14. However, I am finding it quite helpful to figure out the errors (too many to file Errata) as it gives you some extra thinking to do rather than just read. Fun debugging. Back in the old days, Meccano kits had construction instructions with deliberate mistakes for us budding engineers!