Common Sense will allow players of Europa Universalis IV to have new possibilities with diplomacy and the internal development of nations.
This allows you to peacefully develop your nation and build a 'tall' empire, whilst also giving you the tools to execute grand diplomacy. Game changing religious features add depth and intriguing complexity to the gameplay.

Work closely with your subjects and better control them through interactions and decrees should make common sense for anyone with designs to get to terms with the internal struggles of constitutional monarchies.