| 1 | Technological crisis | data growth & related consequences, jet engine failure, power outage, grid backout, cyber espionage, etc. | Caused directly by technology or malfunction or uncontrolled technology use. |
| 2 | Financial/business crisis | The great depression (1920/30), Financial crisis of 2007/2008, Lehman Brothers, Bear Sterns, Enron. Etc. | Direct impact on finance and business. Generally, no risk to human lives. |
| 3 | Natural crisis | tsunami, volcano, earthquake, flooding, draught, epidemic, hurricanes, storms, etc. | Beyond human control and catastrophic. Caused by natural forces and affects human lives. |
| 4 | Men-made crisis | forest fire, wars, riots, pollution, global warming, Corruption, sanitation/hygiene, etc. | Could have been avoided and entirely set by human actions |
