I'm currently making what is shaping up to be the ideal medieval scenario (for Civilization IV - Warlords) in my eyes. I have arranged for every nation their unique unit, but the problem is that no medieval scenario is really worth playing as long as there is technology advance - you will play it for a few turns and then advance to the next technological era, even when you play "marathon" and tweak game speed to multiply it by three (I believe that's the max). I really cannot believe that Civilization IV comes without an option to stop technology advance. Last time I mentioned this, alterting the tech-tree was mentioned, but no one had done it and nothing happened. However, in the Warlords expansion, while playing the Rise of Rome scenario, I noticed how the tech-three had been changed and there was no technological advance - instead techs were replaced with the creation of great people and upgrading of units. What I ideally would like to see is a tech-tree without any technologies so that I'm sure that the units choice and styles of the civilizations in my scenario will never change (I have designed an unique set of technologies for each nation to fit their style and forbidden tech trading). I also need to be sure that no great scientists or wonders will somehow be able to discover new technologies for nations. In itself, preventing technology advance would be a satisfactory solution, however there is also another element. The AI tends to favour science a lot and I would think that even though you change the tech-three it would still have 100% science if it can afford it. That leaves it at a fairly big disadvantage. So, if it would be possible to stop that, I would prefer that as well. I don't have any great overview of the XML files or how to edit them. So, I'm asking anyone with the necessary skill to either do it or, if you aren't bothered about the problem (which I think it crucial for non-modern scenarios), tell me how to. Of course, if there have already been made some roundabouts to stop technology advance you can just refer me to those.