Every thesis states a main point. A strong thesis also gives the essay something worth doing, and something it can finish.
- Specific: it names exactly what you will show, not a vague “good” or “bad.”
- Arguable or worth explaining: a thoughtful reader could disagree, or would learn something.
- Supportable: you can back it up with evidence in the space you have.
Key idea
A strong thesis is specific, arguable (or worth explaining), and supportable in the length you have. Too broad, too obvious or too vague, and the essay has no clear job.
Why it works
An obvious thesis (“Pollution is bad”) gives the reader no reason to read on. A vague one (“Social media has pros and cons”) can’t guide the paragraphs. A huge one can’t be proven in five paragraphs. Purdue OWL’s thesis guides make the same point: the thesis should take a position others might challenge, and be narrow enough to support.
Worked example: From vague to strong
Strengthen: “Video games have good and bad effects.”
- Vague: which effects? for whom?
- Pick one specific, arguable point.
- Make it supportable: one kind of game, one effect.
Answer: “Strategy games can improve planning skills, because players must think several moves ahead.”
Worked example: From too broad to strong
Strengthen for a three-page essay: “World War II changed everything.”
- “Everything” can’t be supported in three pages.
- Narrow to one change and one place.
Answer: “World War II opened factory jobs to American women, changing what many families expected women to do.”
Common mistake
Choosing a thesis too broad to support, or too obvious to need an essay. Check with two questions: Would anyone disagree, or learn something? Could I support it well in the pages I have? Both answers must be yes.
An arguable thesis is not the same as a controversial one. “Our library should open on Sundays” is arguable and calm. Strong writing takes a clear position on a question that matters to its readers, and supports it with care.