Writing fundamentals
Thesis statement vs. research question
A thesis statement asserts a claim you will defend. A research question asks something you will investigate. Which one you write depends on the genre: argumentative essays get a thesis; empirical studies and qualitative theses often get a research question first, then a thesis. Here's how to know which one your assignment wants.
The core difference
Thesis statement: 'Instagram harms teen girls' body image because algorithmic feeds reward extreme thinness.' You will defend this claim with evidence. Research question: 'How does Instagram use affect body-image outcomes in US teen girls aged 13-17?' You will investigate this question with data or synthesis. The thesis has a period; the question has a question mark. That's a real distinction.
When to use a thesis
Argumentative essays (English 101, composition, most humanities courses). Literary analyses. Position papers. Op-eds and rhetorical writing. Any assignment where the verb in the prompt is 'argue,' 'defend,' 'claim,' 'evaluate,' or 'critique.' Length: 1 sentence, usually the last sentence of the intro.
When to use a research question
Empirical studies (quantitative or qualitative). Systematic reviews and meta-analyses. Nursing PICOT projects. Thesis proposals in the sciences. Any assignment where you're generating findings, not defending a preexisting position. Length: 1 sentence, usually italicized in the intro of the proposal.
When you need both
Full research papers and theses: the research question sits in the introduction; the thesis (called the 'answer' or 'main finding') is derived after the analysis and stated in the discussion. In an APA-format empirical paper, the research question appears in the intro; the thesis appears at the top of the discussion section.
Common mistakes
Writing a research question when the prompt asks for a thesis (loses points for weak argumentation). Writing a thesis when the prompt asks for an inquiry (loses points for confirmation bias). Combining the two into one sentence ('This paper argues that Instagram harms teens by asking how algorithmic feeds affect body image') — pick one framing per sentence.
Examples across disciplines
Nursing PICOT: 'In adults with type 2 diabetes (P), does structured coach-led exercise (I) compared to usual care (C) reduce HbA1c (O) at 6 months (T)?' This is a research question, not a thesis. Business capstone: 'This capstone recommends that Company X exit the European retail market to redeploy $220M of working capital into US e-commerce.' This is a thesis, not a research question.
Frequently asked questions
Can a thesis be a question?
No. A thesis is a declarative sentence. If you're writing a question, you're writing a research question — a different genre.
How specific should a research question be?
Specific enough to be answerable in the scope of the paper. 'How does technology affect students?' is too broad. 'How does daily Instagram use affect self-reported body image in US public-high-school girls aged 14-16?' is answerable.
Do research papers always need both?
Empirical papers (with data) — yes: research question up front, thesis in the discussion. Literature-based papers — usually just a thesis.
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