Action points

Action points are a resource that limit the amount of things you can do per turn in GambCiv.

Huts
Constructing huts increases your number of citizens. Each turn, you get one one action point per citizen that you have.

Farmhouses
Upgrading a hut to a farmhouse causes it to count as two huts during the citizen calculations.

Uses
Nearly every thing you do in GambCiv will cost one action point. This is so that turns keep flowing. One player cannot build for an hour in multiplayer and make the other players wait. Games will end up being the same length, but the turns will rotate more frequently.

Math
Each turn, the game resets your citizen count to five. Then it counts how many huts you have. For each one it adds (25/citizens) to your number of citizens. Wesnoth drops everything after the decimal point.

If you own four huts, that ends up working like this:

5->10->12->13->14

Farmhouses simply count as two huts in that equation. If you upgraded one of those huts it would become:

5->10->12->13->14->15