Perhaps one of the best ways is by adopting the PICO formulae (although this mainly applies to clinical questions); that is a statement or question that incorporates Population, Intervention, Comparison, and Outcome. Works every time for me.
Kurt Gray and Daniel Wegner (2013) have a short piece (Six Guidelines for Interesting Research) in "Perspectives on Psychological Science" (vol 8, issue 5, pp. 549-553) that offers ideas on how to develop interesting research. They have several tips for developing the research problem/question to include focusing on phenomena, surprising/unintuitive outcomes, and clear plain-language style. I recommend reading this thought-provoking piece.
There’s no standard way to write a statement of the problem, but strive to make it relevant, definitive, and free of ambiguities. In many disciplines, especially those based in quantitative approaches to research, there is an expectation that the problem statement expresses the relationship between two or more measurable properties and thus can be empirically tested. The problem can then be written in the form of a hypothesis, or be stated as a single question such as ‘To what extent do …..’ This could be posed as a declarative sentence followed by a series of sub-problems or questions, over the course of your research, return to your problem statement on a regular basis and continue to refine it. With an eye on what you are discovering and the current research, ask yourself if your problem is still relevant, sufficiently narrow, and focused more on its underlying reasons than on approaches and techniques.
Problem Statement (or Motivation for the Study)
– Identify a key point of concern (for example, increasing use or prominence, lack of research to date, response to an agenda, a new discovery, or perhaps one not yet applied to this context).
– Refer to the literature only to the extent needed to demonstrate why your project is worth doing. Reserve your full review of existing theory or practice for later chapters.
– Be sure that the motivation, or problem, suggests a need for further investigation.