What advice would you give an engaged friend to make sure he/she is making the right choice?

In other words, what makes for a sound marriage that you would give your friend as a checklist?

My advice would be to make sure the relationship has love, trust, and mutual respect of each other. Also to make sure they want the same things out of life, decide up front how they will handle their money, and agree on issues that are important to them (politically, religiously, morally, etc.).