Hearts of iron 3 tech tree

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Field Manipulation: Power Plants, shields, some strategic resources.Computing: Science Labs, research, science ships, ship computers, point-defense, sensors.Voidcraft: Ship types and hulls, starbases, strike craft.Propulsion: Kinetic and explosive weapons, thrusters.Industry: Mineral production and storage, robots, building construction.The areas and their subcategories are as follows: Additionally, each research area has multiple subcategories, for a total of 12 such subcategories, and every tech belongs to one of these subcategories. There are three different main research areas in-game, with each area corresponding with one of the research resources.

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Every slot here can have one research project active at a time and every research area has its own slot.