Research Trees

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Here are sequences of research topics needed to unlock all the technologies in the game.

Laser Weapons

Laser Weapons  (tech breakthrough)
  |
Laser Pistol
  |
Laser Rifle
  |  
Heavy Laser       
  |  
Laser Cannon 
(Laser Tank)
  | 
Laser Defence

Plasma Weapons

    Heavy Plasma               Plasma Rifle 
         |    Heavy Plasma Clip   |  Plasma Rifle Clip  
         |___________|            |__________|
                 |                       |
                 |                       |
                 |__________OR___________|
                            |
                       Plasma Beam
                   (Hovertank/Plasma)* 
                            |
                      Plasma Defence

* New Fighter Craft must also be researched before you can build hovertanks

Fusion Weapons

 Blaster Launcher    Blaster Bomb
             |___________|
                  |
               Fusion Ball
          (Hovertank/Launcher)*
                  |
          Fusion Ball Defence

* New Fighter Craft must also be researched before you can build hovertanks.

Armor

      Alien Alloys
              |  
Elerium-115  Personal Armor  UFO Power Source      
|_____________|_________________| 
          | 
          |     
     Power Suit      UFO Navigation  
          |_________________|   
                   |
              Flying Suit 

Craft

Alien    Elerium        UFO            UFO
Alloys      115     Power Source   Navigation
|___________|___________|______________|
           |
   UFO Construction
           |
           |
   New Fighter Craft*
      (Firestorm)
           |
New Fighter-Transporter
      (Lightning)
 __________|____________
 |                      |
Grav Shield     Ultimate Craft (Avenger)

* New Fighter Craft must be researched before you can build hovertanks

Psionics

Any Live Psionic Alien
  |
Psi Lab
  |_______
  |       |
Psi-Amp Mind Shield

Hyper-Wave Decoder

Any Live Alien Navigator
  |
Hyper-wave Decoder

Endgame

These research topics must be completed in order to travel to Cydonia and finish the game.

Any Live Alien
 |
Alien Origins
 |
 | Any Live Alien Leader
 | /
The Martian Solution 
 |
 | Any Live Alien Commander
 | /
Cydonia or Bust
 |
 | Avenger
 | /
Cydonia (mission)

Alien Commanders can be found on Battleships, or in alien bases. An alien Commander will also always accompany a base invasion force. The Unofficial Strategy Guide incorrectly states that only a Commander from an alien base can be used to give access to "Cydonia or Bust". In practice, any Commander will do -- so long as The Martian Solution has already been researched. Should you research a Commander prior to this, you'll have to capture another.

Individual topics

Researching these topics will not unlock any technologies beyond themselves.

There are also four UFO Components which can be researched but which have no practical value:

A fifth component, Alien Reproduction, cannot normally be found in the game, although it can be researched if you add it to your General Stores using a game editor.


Research Tree

UFO:EU Research Tree
Explanations

See Also

Research (TFTD)

UFO Badge X-COM: Enemy Unknown/UFO Defense
Research:BasicsPopular Sequences and TipsTreesLive AliensTechnical Details