I am creating my first mod. I am ok with SQL and I understand LUA. I have already made my new tech tree, some of my buildings and ajusted my terrain/feature/ressources. Thank LeeS for his posts... Now I want to do something tricky... for me. I want to implement a new Yield for plot, something like Trade in civ revolution, that we can convert in gold or sciences. I also want to add the fonction in the CityPanel (maybe at the YieldFocus) to make the choice for each city. Is this feasible?