Dickeson--Here There Be Dragons

Multiply the illustrations by a dozen. Don't attempt major model changes without considering a set of risks with which you aren't prepared to deal. Many times you just cannot shift gears. You just can't get there from here.

Look at any change in market or production process and ask some dumb questions, like "Will my critical planning or budgeting assumptions still apply? Can I use my existing job cost tracking system?" Spend days making a List of Stupid Questions. Try to distinguish disruptive from sustaining technologic change.