https://teanmoon.tumblr.com/post/177310525755/decision-tree-for-holes-and-splits-this-tree-is

This tree is meant to help diagnose the most common causes of unwanted splits and holes in a CAS mesh. I have tried to include all the causes of holes, but I can’t guarantee I have them all, since I’m always learning new things about cc creation. This tree is aimed at helping people identify their problems so that they can better search for tutorials on fixing the issues.