[edit] First kind
A sighting of one or more unidentified flying objects;
Flying saucers
Odd lights
Aerial objects that are not attributable to human technology.
[edit] Second kind
An observation of physical evidence of extra-terrestrial visitation;
Footprints
Heat or radiation
Damage to terrain
Crop circles found in the vicinity of a UFO sighting
[edit] Third kind
An observation of one or more occupants associated with one or more crafts.
[edit] Hynek-Bloecher Scale Subtypes
Subtypes of the Hynek scale, as identified by Ted Bloecher;
A: An entity is observed only inside the UFO
B: An entity is observed inside and outside the UFO
C: An entity is observed near to a UFO, but not going in or out.
D: An entity is observed. No UFOs are seen by the observer, but UFO activity has been reported in the area at about the same time
E: An entity is observed. But no UFOs are seen and UFO activity has been reported in the area at that time
F: No entity or UFOs are observed, but the subject experiences some kind of "intelligent communication"
G: Abduction
Subtypes D, E, and F may be unrelated with the UFO phenomenon.[1]
From UFO Casebook's Encounter Classification charts:
H: The alien is either injured, captured, and/or killed by the witness(es) and/or military personnel. The UFO may be captured and/or destroyed by witness(es) and/or military personnel.
