@cstross @SteveBellovin @wolfsbruder
We've been trying since Plato. One really needs the will of the people, as a good set of rules is never enough on its own.
That said: I've studied several over the years and the #GermanBasicLaw is one of the least gamable constitutions in my view. (It's a temporary measure that has lasted for 3/4 of a century, too.)
The French Fifth Republic constitution is fairly robust, but not quite as good I think. But that's on version 5.24 !