One thing I'd like to see at the beginning is some instruction about how you shouldn't introduce a new cat to your herd until after they have been vet checked for spreadable diseases. I haven't read all your other articles so maybe you have already covered it. Also, maybe add a bit about how much time it can take for some cats to tolerate each other - so many people expect their cats to be best friends in a week, in reality it can take much longer!