The most important decision in data mining
A whimsical post that includes this pearl:
It is a fact that a prediction model of the right target is much better than a good prediction model of the wrong or suboptimal target.
Same is true for a topic map except there we would say: A topic map of the right subject(s) is much better than a good topic map of the wrong subject(s).
That means understanding what your clients/users want to talk about. Not what hypothetical Martians might want to talk about. Unless they land and have something of value to trade for modifications to an existing topic map. 😉