In Vinci, you play a civilization for some period of time and then declare it to be "in decline", meaning you sit out a turn and then start a new one. If you go into decline too quickly you're signing up for unneeded churn, but if you wait too long your rate of gaining points drops and you fall behind. What's a good strategy for deciding when to make this change?
Factors that seem to be relevant: the queue of upcoming civiliations (though there will be some turnover before your next turn), how "far along" the other civilizations are toward decline, score you're currently earning and its rate of change, board position (how hard will it be to enter the board with a new civilization), and...what else? Which of those are the most important?