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Rationalism policy tree (Civ5)

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Rationalism is a social policy tree in Civilization V. It is available at the start of the Renaissance Era. It cannot be active at the same time as Piety in vanilla and Gods & Kings.

Game Info[]

Rationalism improves the ability to use and generate Science Science.

Adopting Rationalism:

  • boosts Science Science gained from research agreements by 50% (Vanilla)
  • grants +15% Science Science while the empire is 20xHappiness5 Happy (GodsKings5 clear)
  • +10% Science Science while the empire is 20xHappiness5 Happy. Unlocks building the Porcelain Tower (BNW-only)

Adopting all Policies in the Rationalism tree will grant:

  • +1 Gold Gold from Science Science buildings (Vanilla)
  • 2 free Technologies. May purchase Great Scientists with Faith Faith (GodsKings5 clear)
  • a free Technology. It also allows the purchase of Great Scientists with Faith Faith starting in the Industrial Era (BNW-only).
Policy Effect Requirement
Secularism Secularism +2 Science Science from every Specialist. Adopting Rationalism
Humanism Humanism +1 20xHappiness5 Happiness (local city 20xHappiness5 Happiness in GodsKings5 clear) from every University, Observatory and Public School (Vanilla and GodsKings5 clear).
Great Scientists are earned 25% faster (BNW-only).
Adopting Rationalism
Free Thought Free Thought +1 Science Science from every Trading Post and +17% Science Science from Universities. Secularism (Vanilla and GodsKings5 clear)
Humanism (BNW-only)
Sovereignty Sovereignty +15% Science Science while your empire is 20xHappiness5 Happy (Vanilla).
+1 Gold Gold from Science Science buildings (GodsKings5 clear and BNW-only).
Humanism (Vanilla and GodsKings5 clear
Secularism (BNW-only)
Scientific Revolution Scientific Revolution Gives 2 free Technologies (Vanilla).
Boosts Science Science gained from Research Agreements by 50% (GodsKings5 clear and BNW-only).
Free Thought (Vanilla and GodsKings5 clear)
Sovereignty (BNW-only)


Civilopedia entry[]

Rationalism is a worldview that looks to reason (rather than, say, faith) to explain the world. Rationalism believes that reason trumps all other ways of interpreting the world, including any data gathered by one's five senses. This philosophy can be traced back to the great Socrates of ancient Greece, and it enjoyed something of a resurgence during the 16th and 17th century in Europe, when it was explored by men like Descartes, Spinoza, and Kant.

Related achievements[]

Eighty-Eight Miles per Hour
Eighty-Eight Miles per Hour
Fully Explore the Rationalism Policy Track.
88 mph was the speed the DeLorean time machine from the Back to the Future film series needed to achieve in order to travel through time.

See also[]

Civilization V Social Policies [edit]
Tradition AristocracyLanded EliteLegalismMonarchyOligarchy
Liberty CitizenshipCollective RuleMeritocracyRepresentationRepublic
Honor DisciplineMilitary CasteMilitary TraditionProfessional ArmyWarrior Code
Piety Free ReligionMandate of HeavenOrganized ReligionReformationReligious ToleranceTheocracy
Patronage AestheticsConsulatesCultural DiplomacyEducated EliteMerchant ConfederacyPhilanthropyScholasticism
Commerce EntrepreneurshipMercantilismMercenary ArmyMerchant NavyNaval TraditionProtectionismTrade Unions Wagon Trains
Rationalism Free ThoughtHumanismScientific RevolutionSecularismSovereignty
Aesthetics Artistic GeniusCultural CentersCultural Exchange Fine ArtsFlourishing of the Arts
Exploration Maritime InfrastructureMerchant NavyNaval TraditionNavigation SchoolTreasure Fleets
Freedom Civil SocietyConstitutionDemocracyFree SpeechUniversal Suffrage
Autocracy FascismMilitarismPolice StatePopulismTotal War
Order CommunismNationalismPlanned EconomySocialismUnited Front