AN1:     Anomalies that do not have lasting physical effects, such as amorphous lights or unexplained explosions.

AN2:     Anomalies with lasting physical effects, such as some poltergeist phenomena, apports (materialized objects), and areas of flattened grass.

AN3:     Anomalies with associated entities. This class could include reports of ghosts, yetis, and other instances of cryptozoology as well as elves and spirits.

AN4:     Anomalous reports in which witnesses experience personal interaction with entities in the reality of the entities themselves. They include near-death experiences, religious miracles and visions, and many cases of out-of-body experiences.

AN5:     Instances that include anomalous injuries or deaths, such as spontaneous combustion or unexplained wounds or even permanent healing.

FB1:     Sighting of a UFO “fly-by” in the sky.

FB2:     UFO fly-by accompanied by physical evidence.

FB3:     UFO fly-by in which beings were observed onboard.

FB4:      Flyby where the witness experienced a transformation of his or her reality into the reality of the object or its occupants.

FB5:      A flyby as a result of which the witnesses would suffer permanent injuries or deaths.

MA1:    UFO observations that involve an object with a discontinuous trajectory (such as a drop, a maneuver, or a loop).

MA2:    Include cases that give rise to physical effects in addition to a discontinuous trajectory.

MA3:    Contains the cases in which objects with discontinuous trajectories when beings are observed on board.

MA4:    Instances involving maneuvers, accompanied by a sense of transformation of reality for the percipient.

MA5:    A maneuver as a result of which the witnesses suffer permanent injury or death.