>>96704276 (OP)
The S.P.E.R.M system for populations/settlements. You need S.P.E.R.M. for places to feel real:
>S - Social
A place for people to socialize. A town square, an alehouse, a club, etc
>P - Political
A place for political decisions to take place. A public forum, town hall, elders house, etc
>E - Economic
How the town generates money or worth. Market stalls, farms, toll booth, etc
>R - Religious
A place for faith, or lack there of. Church, holy grove, cathedral, etc
>M - Military
Some way of at least defending themselves. Watch tower, barracks, castle, etc
Whether it's a minor little hamlet, to a massive capital city, every population needs S.P.E.R.M.