How to write a perfect summary: A complete guide, tips, and examples

Have you ever wondered why, when trying to study a long text, you feel like you're adrift in a sea of ​​information with no direction? It's more common than you think. And this is precisely where one of the most effective study techniques of all time comes into play: summarizing . It's not only essential for saving time and organizing ideas, but it also helps you understand and retain information much better. Mastering the summarizing technique can make all the difference between disorganized studying and clear, effective memorization.

Writing a summary might seem simple at first glance, but the reality is that it's a process with very specific steps and tricks that not everyone knows . Sticking to a superficial definition or simply copying verbatim phrases not only reduces its effectiveness but can also cause you to lose sight of the true purpose of this tool. If you really want to learn how to write a flawless, useful, and original summary , stick with me: here's the most complete, up-to-date, and natural guide you'll find, packed with tips, examples, and exclusive resources.

What is a summary and what is it for?

A summary is a short text that gathers and organizes the main ideas of a longer text , excluding details, examples, and personal opinions. Its main function is to transform dense content into a version that is easier to understand, remember, and review . It is useful in both academic and professional settings, whether for preparing for exams, presenting research, analyzing books, or even for quickly reporting on news or scientific articles.

According to the Royal Spanish Academy, a summary is a “brief exposition, oral or written, of the main components of a subject or matter.” It should be added that its purpose is to facilitate the understanding , study, and transmission of relevant information, using the writer's own language, never copying verbatim fragments (except for essential formulas or definitions).

Benefits of knowing how to write a summary

• It helps to understand the structure and overall meaning of any textWhen selecting the main ideas, you must first understand the overall content.
• Facilitates memorizationBecause by synthesizing the information you adapt it to your own style and make it more accessible to remember.
• It allows for quick review without having to go back to the original document.
• Improve your skills in identifying what is essential versus what is secondary. and it trains you in synthesis and clear writing.
• It contributes to a more organized and coherent oral or written presentation.essential skills for jobs, exams and presentations.

Types of summaries: Which one do you need?

Not all summaries are the same, nor do they serve the same purpose. There are different types of summaries depending on their purpose and the source text :

• Study summaryThe most common type is used for learning and reviewing school or university subjects. It should be objective and include only the key ideas.
• Documentary summary or abstract: Widely used in scientific articles and academic papers. It can be brief and indicative (only outlining the main topics) or more informative (including methodology, results, and conclusions).
• Executive SummaryIn the business and corporate context, it summarizes plans, research, or proposals so that managers or investors can quickly understand the key points.
• Bibliographic summaryBriefly describe the theme, structure, and main elements of a book, useful for cataloging, dissemination, or bibliographic entries.
• Press Briefing: Summarizes the most relevant news of a period, used mainly by media outlets.
• Thesis Abstract: It essentially presents the approaches and conclusions of an investigation.
• Job SummarySimilar to a cover letter or resume extract, but focused on highlighting skills, competencies, and professional achievements.

Be clear about what type you need before you start, as each one focuses more on certain elements and influences the tone and structure of the summary.

Essential steps for creating an effective summary

Creating an effective summary requires following a sequence of steps that take you from understanding to synthesis and writing.

1. Analyze the title and context of the original text
   Before diving into the document, consider the title, author, and source. What is it about? What approach do you think it will take? This will give you a clear idea of ​​the central theme and guide your reading.
2. First reading comprehension
   Read the entire text calmly and carefully. Try to grasp the overall meaning and general structure. If there are any unfamiliar words, look up their meanings.
3. Underline or highlight the main ideas, distinguishing the essential from the accessory.
   On a second reading, highlight key elements with colors or underlines. You can use color codes: red for titles and main topics, yellow for keywords, green for definitions, blue for important dates, etc. This will help you organize the information at a glance.
4. Classify the ideas: main, secondary, and complementary.
   Main ideas summarize the essential content of each paragraph. There is usually one key idea per paragraph, which explains or develops the central theme. Supporting ideas refine, exemplify, or expand upon it. Ignore details, anecdotes, embellishments, or repeated information.
5. Make marginal notes and take notes
   Write brief notes or short phrases (3-4 words) with the key ideas of each section.
6. Organize the information visibly
   Create an outline, synoptic chart, or outline, placing the most important ideas at the top and the more specific or supporting ideas below. This will allow you to see the hierarchical and dependency relationships between concepts.
7. Transcribe the underlined text and rearrange it.
   Write down the main ideas on another piece of paper and arrange them into complete sentences and paragraphs, linked logically and coherently.
8. Write the summary in your own words
   Write the text making sure it is clear, without repetitions or unnecessary subordinate clauses. Avoid copying verbatim fragments from the authorexcept for essential citations or definitions.
9. Use an impersonal style, in the third person and present tense
   Do not use "I" or "we"; avoid personal opinions, judgments, or evaluations. Verbs should be in the present tense, unless the context requires otherwise.
10. Avoid lengthy lists and the passive voice
    It is better to generalize concepts and look for active phrases, which are much easier to read and remember.
11. Check and adjust the extension
    A summary should normally take up a maximum of 25% of the original textEliminate extraneous phrases, superfluous words, and anything that does not provide essential information.
12. Give it a clear, short, and specific title.
    It can be the same as the original text, an adaptation, or a phrase that summarizes the content of your summary. Ideally, it should reveal the central theme concisely.
13. Cite your sources if necessary
    Please indicate the author, the title of the text, and the publisher or website from which you obtained the information, especially if the summary is for academic or professional work.
14. Read and correct the final summary
    Check that it reflects all the essential ideas, is well-written, and can be understood independently of the source text. Ask someone else to read it and assess whether it is understandable without having access to the original.

Ideal structure of a good summary

In general, a summary should contain certain elements to ensure its effectiveness and coherence:

• Title: brief, clear and relevant to the content.
• Introduction: one or two paragraphs that state the main idea and the objective of the text.
• Development: where the essential ideas are gathered, organized into short and connected paragraphs.
• Conclusion (optional): final paragraph that summarizes the overall meaning, although in many summaries this section is omitted.
• Cited sources: author, title, publisher, year or URL.

Basic example of structure:

• TitleThe photosynthetic process in plants
• IntroductionPhotosynthesis is the process by which plants produce their food by harnessing solar energy.
• DevelopmentThis mechanism occurs in the leaves and involves the transformation of solar energy by chlorophyll, incorporating carbon dioxide and water to generate glucose and oxygen. The process is essential for life on Earth.
• Fonts: Encyclopedia of Biology, Editorial X.

Recommendations for a flawless summary

• follow a logical orderOrganize the ideas from the most general to the specific.
• Do not include personal opinionsAlways maintain objectivity.
• Use connectors and short phrasesThey promote cohesion and clarity.
• Avoid direct quotesJust compile ideas, don't reproduce phrases from the author.
• Eliminate the unnecessaryIf an idea doesn't contribute anything essential, discard it.
• Check for consistencyThe text must be complete and well-structured.
• Use clear and direct languageDo not use technical terms unless they are essential to the topic.
• Don't overuse enumerations: Generalize whenever possible.

Common mistakes when writing a summary (and how to avoid them)

• Copying verbatim or long phrases from the original textIt detracts from originality and makes it difficult to understand.
• Include personal opinions, interpretations, or assessmentsThe summary is not the place to give your opinion.
• Losing the logical thread between ideasIf you jump from one idea to another without connection, the text becomes confusing.
• Omitting key concepts due to excessive summarizationSynthesizing is not about cutting things out indiscriminately, but about keeping what is important.
• Making it too long or too short: Respect the balance, neither a summarized plagiarism nor a list of headlines.
• Do not check spelling and grammarA good summary should be well written.

Practical example of a step-by-step summary

Let's take as our base text a brief extract on gravity and Newton's life (summarized and adapted):

“Newton was an English scientist who discovered the law of gravity. He observed that the force that makes an apple fall is the same force that keeps the Moon in orbit. He demonstrated that all bodies in the universe attract each other and formulated the laws that govern the movement of the planets. He was so dedicated that he rarely left his room, devoting himself entirely to his studies.”

Step by step:

1. Comprehensive readingWe understand the topic: Newton and the law of gravity.
2. UnderlinedNewton, English scientist, discovers the law of gravity, the force that makes an apple fall = keeps the Moon in orbit, universal attraction, laws of planetary motion, dedication to study.
3. Notes and brief outline:
   • Newton: Discover Gravity
   • Universal attraction
   • Laws of planetary motion
   • Extreme dedication
4. NewsroomNewton was an English scientist who formulated the law of gravity, demonstrating that the force that makes objects fall is the same force that keeps celestial bodies in orbit. His research established that all bodies in the universe attract each other, and he developed the laws that explain the movement of the planets. His life was marked by an absolute dedication to study.

Notice how the final text, in just three sentences, captures all the essential information, without copying literal phrases and maintaining logic and objectivity.

How to summarize different types of texts

Summaries of expository texts

Expository texts convey objective information, so your summary should be especially clear and focused on the facts . Identify the structure (introduction, body, conclusion), the key concepts, and the logical relationships (cause, effect, opposition, etc.).

Summaries of argumentative texts

These texts present a thesis, arguments, and conclusions. The summary should include the main point, the essential arguments, and the conclusion , without adding opinions or counterarguments.

Summaries of narrative texts (short stories, novels)

In narrative texts, identify the central theme, the sequence of events, and the main characters . Outline the plot and then summarize the main actions, avoiding secondary details or lengthy descriptions.

Abstracts of scientific articles

These summaries typically include the hypothesis, methodology, results, and main conclusions. Be especially precise and use the terminology specific to the field, but avoid unnecessary technical jargon . For examples, you can consult articles on atlasti.com.

Summaries for academic or university papers

At university, summaries need to be even more concise and professional . Make the most of outlines, maintain objectivity as much as possible, and proofread several times to ensure every word counts.

Keys to synthesizing information without losing anything important

Globalize the information: join several phrases that express the same idea or that can be summarized in a single proposition.

It generalizes individual terms under a category that groups them together. For example, instead of listing countries, say “European countries”.

Use connectors to join phrases and achieve cohesion: because, therefore, however, also, etc.

How much should you summarize?

There is no exact word count, but the general rule is that the summary should not exceed 25% of the original text . However, beyond the word count, what's important is that it contains all the essential information, is well-structured, and can be understood independently.

How to integrate different sources of information into a single summary

When you need to create a summary from multiple sources (books, articles, websites, etc.), the key is to identify commonalities and differences . Read all the sources, jot down the main ideas from each on separate sheets of paper, and then organize them according to their relevance or frequency. This will give you a concise and structured text, without repeating information or omitting any relevant ideas.

How to cite sources in an abstract

If the abstract is for an academic or professional submission, or if it may be published, it is mandatory to cite the original source . There are several common formats for this, depending on the field (APA, Vancouver, MLA, etc.). Always include the author, title, publisher, and year at the end of your abstract, in a bibliography or references section.

Coherence and cohesion in the summary

A summary is only useful if it has coherence and cohesion :

• CoherenceThis means that all sentences and paragraphs serve a single purpose and form a whole that is understandable to the reader.
• CohesionIt is the correct connection between the parts of the text, using pronouns, synonyms, connectors and ordered series to avoid repetitions and logical jumps.

Some cohesion resources you can use:

• ReferenceUse of pronouns to avoid repetition.
• SubstitutionUse synonyms or equivalent words to avoid repeating concepts.
• Logical connectorsBecause, therefore, although, since, despite, etc.

Summarizing is not the same as outlining or creating synoptic charts.

A summary is a complete text, with well-written sentences and paragraphs . It is not a bulleted list, a simple outline, or a synoptic chart. It should be readable and understandable from beginning to end by anyone, even without prior knowledge of the original text.

Summaries according to educational level

The summary technique should be adapted to the course, age, or context:

• Primary and secondarySimple summaries, with short sentences and adapted vocabulary.
• Undergraduate Degrees: Greater ability to synthesize information is required; avoid copying phrases and cite sources.
• UniversityAccuracy, professionalism, and highly polished writing. Requires analyzing, prioritizing, and generalizing concepts with sound judgment.

How to assess if your summary is well done?

Use a self-test or checklist:

• Does it capture the main theme of the original text?
• Can the ideas be understood without consulting the source document?
• Are the main ideas present and are they correctly related?
• Does it avoid examples, details, and personal opinions?
• Is it clear, coherent, and without unnecessary phrases?

Additional examples of summaries according to text type

Book summary

It includes the title, author, central idea, main plot, and relevant characters, all in a single text.

Title: Don Quijote of La Mancha
SummaryThe novel tells the story of a Spanish nobleman who, influenced by reading books of chivalry, decides to become a knight-errant. Along with his faithful squire Sancho Panza, he travels through La Mancha facing absurd situations and fighting for an ideal of justice, which brings him misunderstanding and defeat, but also the admiration of those around him.

Summary of a thesis

TitleImpact of solar energy in rural areas
SummaryThe study analyzes the integration of solar panels in rural communities, evaluating their impact on economic development, quality of life, and environmental sustainability. It uses statistical methods and interviews, concluding that solar energy improves access to basic services and reduces the ecological footprint.

Summary of a scientific article

TitleThe influence of social media on adolescent self-esteem
SummaryThis study explores how social media use affects adolescents' self-image and self-perception. Through a longitudinal study, it reveals that certain usage patterns influence self-esteem positively or negatively, and offers recommendations to promote healthy use of these platforms.

News and press summary

In journalism, the key to a summary is to include only the essential facts: who, what, when, where, how, and why. Eliminate everything extraneous and focus on the main event and its consequences.

Example : The Government approves a new education law that will be applicable from the next school year and that introduces changes in the evaluation system, seeking to improve the academic results of students.

Digital tools to help in the preparation of summaries

• Text processorsWord, Google Docs, etc. They allow you to highlight, organize information, and review easily.
• Apps for diagrams and concept mapsMindMeister, CmapTools, Lucidchart: useful for organizing ideas before writing.
• Online highlighting accessoriesPocket, Evernote, and Notion allow you to select key fragments and compile them for later synthesis.
• Collaborative study platforms: How Santander Smartbank o Unibetas where you can find teaching resources and examples of summaries.

Role of citation and references according to the type of abstract

When the summary has an academic purpose, citing the source correctly is essential . The most commonly used styles are:

• WATERFor psychology, education, and social sciences.
• Vancouver: For medicine and health sciences.
• MLA/Chicago: For humanities and literature.

Include the following information in your summary: Author, title, year, and source. Consult the style guide provided by your professor or institution.

When can a summary include direct quotes?

Only in very specific cases, such as precise definitions, mathematical formulas, or essential fragments to maintain the original meaning. In all other situations, the rule is to paraphrase using your own words.

Summarizing texts of very different lengths: from a paragraph to a book

For short texts (such as brief articles or news reports), the key is to condense all the information into a single paragraph, avoiding repetition of the main idea. For longer texts (books, theses), the process requires outlining by chapters or sections and then summarizing each part, bringing everything together into a continuous and coherent text.

How to write a good 100-word summary?

Read the text several times, identify the 2-3 main ideas, and express them in short, direct sentences, eliminating all secondary explanations. Write an initial draft and then shorten it by removing unnecessary material until you reach the word limit.

Charts and diagrams for preparing a summary

• Double column tableOn the left, main ideas; on the right, secondary ideas or examples.
• Hierarchical scheme: From the general to the specific, in the form of a ladder or a tree.
• Conceptual mapKeywords joined by arrows showing logical relationships.

How to evaluate a summary (for teachers or self-correction)

Verify that:

• Gather all the essential ideas.
• Avoid irrelevant or repetitive information.
• It is written in a coherent and independent manner.
• The style is clear and objective.
• Use connectors and short phrases.

Bibliography and resources for perfecting the summary technique

• Ducrot, Oswald and Tzvetan Todorov: Encyclopedic Dictionary of the Language Sciences.
• Van Dijk, Teun: The Science of Text.
• Calvo Guillén, GC (2020). Teaching materials for teaching summarizing and classifying in Library Science.
• concept.of
• University guides such as that of the University of Malaga (PDF UMA).

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