June 2011
Intermediate to advanced
344 pages
8h 35m
English
Sometimes, hierarchies work well, but they need to be obvious and commonly accepted.
Hierarchies work less well if people have to come up with them on their own, especially when several people share a hierarchy.
Humans are pretty good at dealing with time and space. Try to use them, rather than hierarchies, to organize user data.
If you must use hierarchies, try to keep the structure shallow, allow items to exist in more than one place, support metadata, and support alternative ways of accessing the data.
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