What would be an appropriate question to use as the basis of a research essay?

Questions that would be appropriate for use as the basis of a research essay include:

What are the most effective strategies for ensuring that most students in city schools graduate?

What water conservation strategies should Phoenix adopt in order to ensure a consistent supply of water in the coming years?

What actions should the city council take to effectively stimulate the retail economy in the downtown core?

What strategies should our district enact in order to effectively reduce breaking-and-entering crime rates?