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  • Oscar Amaya thinks this is interesting:

When considering breadth, you should be sensitive to people’s visual scanning abilities and to the cognitive limits of the human mind. Now, we’re not going to tell you to follow the infamous seven plus-or-minus two rule.[6] There is general consensus that the number of links you can safely include is constrained by users’ abilities to visually scan the page rather than by their short-term memories.

Instead, we suggest that you:

  • Recognize the danger of overloading users with too many options.

From

Cover of Information Architecture for the World Wide Web, 3rd Edition

Note

Validate broad and depth of structure taxonomy