Development

Adding development points to your provinces is now done through a passive system of hidden events which allow development to naturally build over time. Any modifier to Development Cost (except the modifier from province development itself) will affect the speed at which your provinces grow, as well as factors such as province size, land ownership, and stability. Passive development can be sped up by certain Realm Management decisions such as Levy Exemption (-10% Development Time) and Collect Light Tax (-10% Development Time) or events.

Passive growth will not occur until 1370, after the Black Death has passed through.

From 3.10.2 onward, all development and related events should be scaled up 10 times (but there are currently still a few mechanics that have not been updated), and all the costs associated with it changed in order for it to cost roughly the same as before.

Manual development of base tax and production is still possible in provinces where the crown/state owns the majority of the land as well as in the capital.

The Realm Management area interface displays the passive growth modifiers: