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In general, patterns of terrorist attacks are very diverse across time and place and the GTD supports in-depth analysis of these patterns. Likewise, only 20 perpetrator groups are responsible for half of all attacks from 1970 to 2018 for which a perpetrator was identified. The attacks in the GTD are attributed to more than 2,000 named perpetrator organizations and more than 700 additional generic groupings such as "Tamil separatists." However, two-thirds of these groups are active for less than a year and carry out fewer than four total attacks. For example, about half of all terrorist attacks in the GTD are non-lethal, and although approximately one percent of attacks involve 25 or more fatalities, these highly lethal attacks killed more than 140,000 people in total between 19.
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Some general findings derived from the GTD involve the nature and distribution of terrorist attacks.