Quick Fix: If your document or outline feels cluttered, break the main question into 2–4 focused sub-questions that start with “How,” “What,” or “Why.” Keep each sub-question open-ended and avoid yes/no phrasing.
What’s going on here?
A sub-question breaks down a big research topic into smaller, answerable chunks.
Instead of wrestling with “What causes urban flooding?” in one massive bite, you split it into focused pieces like “How does storm-water infrastructure affect flood frequency?” or “What role do impervious surfaces play in runoff volume?” As of 2026, most academic style guides (APA, Chicago, MLA) still recommend keeping sub-questions open-ended and analytical rather than descriptive or yes/no questions.
How do I actually make these sub-questions?
Follow a simple six-step process to turn your main question into focused sub-questions.
- Start with the big question. Example: “How can local governments reduce flooding in residential neighborhoods?”
- Pull out the key pieces. Storm-water systems, impervious surfaces, zoning laws, funding.
- Write your first drafts.
- “How does current zoning policy influence the proportion of impervious surfaces in residential zones?”
- “What is the relationship between drainage-pipe age and flood frequency in the 10 most affected census tracts?”
- “Why do some neighborhoods with green infrastructure experience fewer basement backups than others?”
- Put each one to the test. Ask yourself: Can this be answered with a simple yes or no? Does it need real analysis or data? If either answer is “yes,” tweak it so it starts with “How,” “What,” or “Why.”
- Put them in order. Start with the sub-question that’s most foundational—it’ll set up the next layer of answers.
- Watch for duplicates. If two sub-questions overlap too much, combine or drop one.
What if I end up with too many sub-questions?
Group related ideas under a single umbrella question.
- Too many sub-questions? Group related items under a single umbrella. Example: combine “cost of pipe replacement” and “annual maintenance budget” into “What budgetary constraints limit pipe-replacement frequency?”
What if I end up with too few sub-questions?
Dig deeper—your main question probably hides some assumptions.
- Too few sub-questions? Re-examine the main question for unstated assumptions. Add one that targets a hidden variable (policy, climate trend, resident behavior).
What if I’m stuck on wording?
Use a simple six-step template to nail the phrasing every time.
- Stuck on wording? Use the six-step template: (1) choose starting phrase (“How does…”), (2) name the dependent variable (flood frequency), (3) identify the group (census tracts), (4) decide order, (5) include timeframe if relevant, (6) avoid yes/no phrasing
Any quick ways to avoid problems up front?
Start small, use a checklist, and get early feedback.
- Begin tiny. Draft 2–4 sub-questions before you collect any data. If you can’t state them clearly, your main question is probably too broad.
- Run a quick check. Each sub-question should be focused, researchable, and analytical. Test it against the six-point criteria in Harvard Health’s guide to well-formed research questions.
- Get a second opinion. Share your sub-questions with a colleague; if they can’t summarize the goal in one sentence, revise.
- Keep a “parking lot.” If a random idea pops up while drafting, jot it down separately instead of shoehorning it in.
- Revisit yearly. As new data or policies roll in, check whether your sub-questions still hit the most urgent parts of the topic.
