A couple of guidelines for developing a good research question:
A question that can be answered within the parameters that the professor has given you.
Not to narrow- that a couple of facts could answer it "Has the population of the earth increased in the last century"
Not to broad- that you would have to write a whole book or that can't really be answered "Why do some countries a higher population than others?"
Quantifiable- Have to be able to measurable outcomes
Some questions to help specify your research question are the:
EXPAND your search results:
NARROWING your search results:
Based on the reference sources consulted: