Lilia, as per usual, has posted something interesting which confirms my doubts on manual categorisation (i.e. we all do it differently)
People just do not share the same mental model of their shared domain, I was told once that libraries have 4 classification systems to classify their books as one falls very short of pleasing all.
I'm surprised Lilia data is not worse, my experience is that even lower numbers are to be expected, even in domains that are thought by outsiders (e.g. Engineering) to be highly structured and standard.
To me this is an important fact why users get so dissatisfied with stored categorised information, i.e. they do not follow/agree with how it is categorised.
One thing automation may do is give us consistency, even if we do not agree with the classification at least by the fact that it is consistent we will have the chance to learn the automata’s logic.
