I'm wondering if a fuzzy password system would be in any way beneficial to users, or worth implementing.
The idea would be that a certain margin of error is acceptable for allowing the user to log in.
Things would be kept track of like what the user remembers best about the original password and what they obviously never seem to recall at all.
The user would be allowed and/or expected to slightly change their password with each attempt.
They would be expected to be sticking with their "fuzzy" recollection of the password. Going back numerous stages might be expected, but remembering the password in a grossly accurate manner would not.
Allowed numbers of attempts per day would also change gradually based on the user's difficulty in logging in. If the user managed to hit one or more of their previously remembered fuzzy recollections of the password, then the assumption would be made that they legitimately are having "trouble", some error margin would be temporarily increased, and they would be asked to try again the next day. With the slightly increased error margin, they might be in luck. If they still fail, they might be S.O.L.
The idea is that the users might be lacking the usually expected level of either sophistication or completeness in their brains, and so some automatic compensation might be needed to allow them to make errors in authenticating their identity but still have normal access to services.