- Class 1a
- Class 1, Corroboration: Reports involving a sighting, and accompanied by another form of support.
1a A sasquatch/bigfoot specimen has been collected (alive or dead).
- Class 1b
- Class 1, Corroboration: Reports involving a sighting, and accompanied by another form of support.
1b A report investigation results in a sasquatch observation or the documentation of clear tracks or other forms of physical evidence by an investigator.
- Class 1c
- Class 1, Corroboration: Reports involving a sighting, and accompanied by another form of support.
1c An investigator determines that a visual encounter with a sasquatch/bigfoot by a very reliable observer is a distinct possibility, tangible corroborating evidence is documented, and all other sources can be reasonably ruled out.
- Class 1d
- Class 1, Corroboration: Reports involving a sighting, and accompanied by another form of support.
1d A visual encounter with a sasquatch/bigfoot is a distinct possibility involving two or more reliable observers, and all other sources can be reasonably ruled out.
- Class 2
- Class 2, Competency: Reports involving sightings by professionally trained or highly skilled observers.
2 Investigator determines that a visual encounter with a sasquatch/bigfoot is a distinct possibility, the observer is exceptionally trustworthy, professionally trained, and experienced in the outdoors and/or is accustomed to looking for and recording details (e.g., biologist, anthropologist/archaeologist, ranger, trapper/tracker/seasoned hunter, bird watcher, game warden, naturalist, law enforcement), and other explanations can be reasonably excluded.
- Class 3a
- Class 3, Credibility: Sightings or possible wood ape evidence reported by credible witnesses.
3a Investigator determines that a visual encounter with a sasquatch/bigfoot is a distinct possibility, the observer is credible, and all other sources can be reasonably ruled out.
- Class 3b
- Class 3, Credibility: Sightings or possible wood ape evidence reported by credible witnesses.
3b Unidentifiable vocalizations were reported and there is accompanying tangible evidence to possibly indicate the presence of a sasquatch/bigfoot, the observer is very reliable, and other sources can be reasonably ruled out.
- Class 3c
- Class 3, Credibility: Sightings or possible wood ape evidence reported by credible witnesses.
3c No visual encounter occurred, but physical evidence was found to indicate the presence of a sasquatch/bigfoot (tracks, hair, scat, etc.), the observer is very reliable, and other sources can be reasonably ruled out.