Research (Long War)

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Autopsies now require multiple corpse specimens (so, 1: you cannot 'double-dip', and 2: do not worry if you cannot go for a capture on an alien's first appearance), and are a prerequisite before you can do an interrogation on that species (when applicable). In addition, some later species have other prerequisites that need to be completed beforehand (such as the Mechtoid Autopsy now needing both Sectoid Autopsy and Alien Biocybernetics to be completed before it's unlocked). Also note that South America's bonus has been changed to a Power-related reduction; you'll naturally be poking aliens with pointy implements for much longer times.

Interrogations still have the Alien Containment/Arc Thrower prereq--- and it's highly advisable to keep both, and to continue to capture aliens when the opportunity presents itself, as captured aliens are very valuable Council Requests, on top of the continued collection of alien weaponry. Research Credits are also a prime time-saver:

• Sectoid: Cybernetics
• Thin Man: Laser Weaponry
• Floater: Aerospace
• Muton: Gauss Weaponry
• Berserker: Armor
• Heavy Floater: Plasma Weaponry
• Sectoid Commander: Psionics
• Muton Elite: All Weapons
• Ethereal: All Tech

Because projects have much longer research times and there are far more projects, research is in general a more time-consuming affair. On the plus side: with far more aliens to kill, you'll rarely be out of Weapon Fragments.

Research

Long War Tech Tree

Available Projects (unfinished)
Name	Prerequisites	Materials	Estimated Time	Unlocks
Xenobiology				Council Requests: Sectoid Corpses (Gives Scientists) Alien Containment (Construction) Targeting Module (Equipment)
Alien Weaponry				Council Requests: Weapon Fragments (Gives Engineers) Scope (Equipment) Weapon Gyros (Equipment - Mech) Mag Pistols (Foundry Project) SHIV Suppression (Foundry Project) Beam Lasers (Research Project)
Alien Materials				Council Requests: Alloys (Gives Engineers) Heat Ammo (Equipment) Alloy Belt (equipment> Alloy Plating (Equipment) Reinforced Armor (Equipment) Enhanced Ballistics (Foundry Project) Alien Metallurgy (Foundry Project) Aircraft Boosters (Foundry Project) Improved Salvage (Foundry Project)
Xenoneurology	Xenobiology			Arc Thrower (Manufacture)
Beam Weapons	Weapon Fragments			Laser weapons
Advanced Body Armor	Alien Materials	12 alloys	14 days (30 scientists)