A system used to categorize the various types of UFO sightings invented by Dr J. Allen Hynek. The categories are as follows...

• NOCTURNAL LIGHT
  Any anomalous light(s) seen in the night sky whose description rules out the possibilities of aircraft lights, stars, meteors and the like.

• DAYLIGHT DISK UFOs
  seen in the distant daytime sky. The UFOs classed in this category can be other shapes as well, like cigars, eggs and ovals.

• RADAR-VISUALS
  Where UFOs are tracked on radar and can be seen at the place illustrated at the same time.

• OF THE FIRST KIND (CEI)
  A UFO in close proximity (within approx 500 feet) of the witness.

• OF THE SECOND KIND (CEII)
  A UFO that leaves markings on the ground, causes burns or paralysis to humans, frightens animals, interferes with car engines or TV and radio reception.

• OF THE THIRD KIND (CEIII)
  A CEI or CEII which have visible occupants.

  There are also two more unofficial classes of Close Encounter...

• OF THE FOURTH KIND (CEIV)
  Abduction cases.

• OF THE FIFTH KIND (CEV)
  Communication occurs between a person and an alien.