An abstract contains a condensed summary of your paper’s purpose, methods, results, and conclusions, written as a single paragraph that lets readers decide whether to read the full work. The exact contents shift depending on your field and the type of abstract required, but most abstracts follow a predictable structure built around four or five core elements.
The Core Elements
Most abstracts, especially in the sciences and social sciences, follow what’s known as the IMRAD structure: Introduction, Methods, Results, and Discussion. The National Library of Medicine recognizes this as the standard format for structured abstracts in databases like PubMed. Even when your abstract isn’t broken into labeled sections, these four elements still serve as the backbone of what you write.
Here’s what each element covers:
- Introduction or background: One or two sentences explaining the problem your research addresses and why it matters. This is where you establish context so the reader understands what gap you’re filling.
- Methods: A brief description of how you conducted the study. This includes your research design, participants or data sources, and key procedures. You don’t need every detail, just enough for the reader to understand your approach.
- Results: The main findings, stated plainly. Include specific numbers or outcomes when they’re central to the paper. This is the part readers scan first, so be direct.
- Conclusions: What the results mean, why they matter, and what implications they carry. If your findings support or challenge existing understanding, say so briefly here.
APA style guidelines specify that your abstract should contain “at least your research topic, research questions, participants, methods, results, data analysis, and conclusions.” That’s a useful checklist even if you’re not writing in APA format.
Informative vs. Descriptive Abstracts
Not every abstract works the same way. The two main types, informative and descriptive, have different goals and therefore contain different content.
An informative abstract acts as a stand-in for the full paper. It presents the key arguments, evidence, and results so a reader who never opens the full document still walks away with substantive knowledge. The majority of abstracts fall into this category. If you’re writing for a journal, a thesis, or a conference submission, you’re almost certainly writing an informative abstract.
A descriptive abstract, by contrast, describes what the paper contains without revealing conclusions or results. Think of it as an outline rather than a summary. It tells the reader the type of information they’ll find, the scope of the work, and the methods used, but it stops short of giving away findings. Descriptive abstracts are usually very short, often 100 words or less, and are more common in humanities papers, book chapters, or review articles where the goal is to characterize the work rather than compress it.
If your assignment or submission guidelines don’t specify a type, default to informative. It’s the more useful format for most readers and the one most instructors and journals expect.
Formatting and Length
Under APA guidelines, an abstract should be a single paragraph, double-spaced, and typically no more than 250 words. Other style guides and journals set their own limits, commonly between 150 and 300 words. Always check the specific requirements for wherever you’re submitting. Conference abstracts sometimes allow up to 500 words, while some journals cap you at 150.
Regardless of word count, the abstract sits on its own page, right after the title page and before the body of the paper. It should not include citations, footnotes, or references to figures and tables in the main text. The abstract needs to stand alone because many readers will encounter it in a database search without access to the rest of your work.
Adding Keywords
Many journals and style guides ask you to include a short list of keywords beneath your abstract. In APA format, you indent a new line below the abstract paragraph, write “Keywords:” in italics, and then list three to five terms that capture the central topics of your paper. These keywords help search engines and academic databases index your work so other researchers can find it. Choose terms that someone in your field would actually type into a search bar, not just words that appear frequently in your text.
Writing an Effective Abstract
The biggest mistake people make is writing the abstract before the paper is finished. Your abstract should be the last thing you write, because you need to know your actual results and conclusions before you can summarize them accurately. Draft the paper first, then distill it.
Use past tense for methods and results (you already did the work), and present tense for conclusions and implications that remain broadly true. Avoid vague language like “results are discussed” or “findings will be presented,” which belongs in a descriptive abstract at best and tells the reader nothing useful. Instead, state the findings directly: what you found, how large the effect was, whether the hypothesis held up.
Keep jargon to a minimum. Your abstract reaches a broader audience than the full paper does, so write it for someone in your general discipline who may not share your narrow specialty. Every sentence should deliver a concrete piece of information. If a sentence could be removed without losing anything the reader needs, cut it. At 250 words or fewer, you don’t have room for warm-up sentences or filler.
One practical test: read your abstract in isolation, without the paper in front of you. Can you identify the research question, how it was studied, what was found, and why it matters? If any of those four pieces are missing, revise until they’re all there.