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Class 1a
A sasquatch/bigfoot specimen has been collected (alive or dead).
Class 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
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
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
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
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
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
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.