A method issue: from definition to rules. An application for answering a family law question: are prenuptial agreements effective or void?

Modern society is so complex that the work of the jurists is often quite difficult. Therefore, we need a grounded method for interpreting the law, balancing old and new techniques. We try to apply this method for answering a modern family law question: are prenuptial agreements effective or void? We compare the answer in different States and for different agreements, finding out some surprises. Then we analyze the Italian approach proposing a new solution for the problem.