By Location

By Personality

By Purpose

By Target

By Issue

Domestic

Crazies

Political

Mass Terror

Revolutionary

International

Crusaders

Non-political

Dynastic Terror

Political

Non-State

Criminals

Quasi-terrorism

Random Terror

Nationalist

State-sponsored

Limited Political

Focused Random Terror

Cause Based

Internecine

Official or State

Tactical Terror

Environmental

State-sponsored

Nuclear

Genocide