Certain questions are on the list of example questions that are quite broad and open to a lot of differing answers that all could be considered correct. A good example of this is our currently highest voted question:
What impediments could prevent civilizations' technology from ever progressing past a medieval stage?
This question could have a lot of different answers, and lots of factors come in to play making most answers speculative. Whether the description of the question could improve it, I'm not sure. But one thing is for sure, it's an open ended question.
Another question that brought this up, and prompted me to open this discussion is:
What environmental factors could prevent a society from developing electricity?
In my experience of SO these types of questions do not fit the Q&A format we have here well. Questions should be answerable without becoming lists or essays. Whilst I understand that it is my opinion the above question will do this, I believe this warrants further discussion as to what we would consider too broad for a question before the site goes into beta.