Investments in research agreements are lost if they are broken. That`s why you should never go to war with your research partners if you can help him -- because you lose both. Reducing research costs: Meeting with CivsMeeting other civilizations that have explored a technology you don`t have, will reduce the cost of this technology. It`s a reasonable mechanic, as if you see someone using a new invention, it becomes easier to discover for yourself. The more you know about the Civs who have studied something, the lower the cost of this technology will be. As you move towards education and scientific theory, other Civs are likely to explore military technologies at the lower end of the tech tree. You will be able to catch up faster in military technology thanks to this one, so meeting Civs on scouting and later with Caravels to explore the world (or when creating the World Congress) is important for the pace of your research. This is: forums.civfanatics.com/resources/research-agreements-bnw.25568/#Costs The bonus for each player is calculated as 50% of the median scientific value for all technologies that the player can currently explore, but the lowest bonus of the 2 participating civs is applied to both civs. As in previous games, there are many ways to achieve victory. The player can focus on scientific research and become the first to assemble and launch a spaceship and win the space race. The player can focus on a diplomatic victory that requires the support of other civilizations and city-states to the United Nations. In the new cultural system of civilization V, composed of "trees" of social policy, the cultural victory over the Brave New World Expansion Pack included the filling of five of the ten "trees" and the completion of the Utopia project (reminiscent of the secret project to Ascent Transcendence in Sid Meiers Alpha Centauri).
 I made a research agreement with an AI at Civ 5, and when it was halfway there, he attacked me. Has that money disappeared for both of us, or can we take it back once I teach him a lesson? City-states, a new feature of the series, are small civilizations with which one can interact, but are not capable of winning. Unlike the great powers, city-states can develop on the territory, but they never create new cities (although they can conquer other cities with military units). In addition to total conquest, great civilizations have the opportunity to befriend city-states through bribes or services. City-states offer the player bonuses such as resources and units that increase as players advance to new eras. In the "Brave New World" expansion package, city-states give allied players additional delegates to the World Congress, which begins in industry time.