If you're reading about surviving a ground-up rewrite when you're supposed to be _doing_ a ground up rewrite, you're doing it wrong. Read about design patterns,

If you're reading about surviving a ground-up rewrite when you're supposed to be _doing_ a ground up rewrite, you're doing it wrong. Read about design patterns, focus on your core business, and stop trying to focus on the "five things to make your rewrite successful".