# How to Define the Main Message of Your Scientific Poster: A Step-by-Step Guide ## Quick Answer - Define your poster's main message by completing one sentence: "After seeing my poster, a colleague should remember that [your single most important finding]." - Test your draft message against your study's actual results and your target audience's background before you design any layout or visuals. - A poster cannot carry multiple main messages without losing clarity, so you must choose one core finding even when your study produced several useful results. ## Why a Scientific Poster Needs a Defined Main Message A scientific poster is a visual communication tool used at conferences, lab meetings, and institutional events. Its purpose is to present a study's purpose, methods, and findings in a format that allows viewers to scan the content quickly and engage the presenter in conversation. Unlike a journal article, which a reader can study over multiple sessions, a poster competes for attention in a crowded room where viewers typically spend only a few minutes at each display. The main message is the single sentence that captures what your study contributes to the field. It answers the question a viewer will ask after reading your title and glancing at your figures: "What did this work find, and why does it matter?" Without a defined main message, a poster becomes a collection of methods, data, and background text that leaves the viewer uncertain about the study's value. Researchers often struggle with this step because they know their project in depth. Every detail feels important, and the distinction between background context, supporting data, and the central finding blurs. The practical solution is to treat the main message as a design constraint. You decide what the viewer must remember, then you build the poster around that decision. This approach mirrors how reporting guidelines work in biomedical research, where authors select the essential elements of a study and present them in a structured way so readers can assess the work reliably. The [EQUATOR Network](https://www.equator-network.org/) provides access to reporting guidelines that help researchers decide which study details to report and how to present them transparently. The same logic applies to poster design. You are not reporting every detail of your work. You are selecting the elements that support one clear message and arranging them so a busy viewer can grasp that message quickly. ## The Core Principle: One Study, One Main Message A scientific poster should communicate one main message. This principle follows from how posters are actually used at conferences. Attendees walk through poster sessions, stop at displays that catch their attention, read the title and abstract, scan the figures, and then either ask questions or move on. A viewer who must hold multiple competing findings in mind while scanning a poster will likely remember none of them. The one-message principle does not mean your study had only one result. It means you must decide which result is the most important for your intended audience. This decision requires you to rank your findings by significance, novelty, and relevance to the field. The ranking is a professional judgment you make based on your data, your knowledge of the literature, and the feedback you have received from mentors or collaborators. Consider a study that tested a new laboratory method and also collected preliminary data using that method. The method validation might be the main message for a methods-focused conference, while the preliminary data might be the main message for a conference attended by researchers who study that specific biological system. The same study can support different main messages for different audiences. Your job is to choose the message that fits the specific conference or event where you will present. This selection process is similar to the decisions researchers make when following reporting guidelines. The [EQUATOR Network](https://www.equator-network.org/) explains that reporting guidelines help authors include the essential information needed for readers to understand and evaluate a study. A poster is a condensed version of that same responsibility. You include the essential elements that support your main message, and you leave out details that do not serve that message. ## The One-Sentence Takeaway Exercise The one-sentence takeaway exercise is a structured method for distilling your study into a single clear message. It forces you to make the decisions that many researchers postpone until they are arranging text boxes on a poster template. ### Step 1: Write Your First Draft Write one sentence that completes this prompt: "After seeing my poster, a colleague should remember that [your finding]." Do not worry about elegance in the first draft. Write the sentence as it comes to you. A first draft might read: "After seeing my poster, a colleague should remember that our new extraction method recovers more RNA from frozen tissue than the standard kit." This sentence is a starting point. It identifies the subject of your poster and the claim you are making. Most first drafts are too broad, too narrow, or focused on the wrong element. The next steps refine the sentence. ### Step 2: Check the Sentence Against Your Data Read your sentence and ask whether your data actually support it. A main message must be defensible. If your sentence claims that the new method recovers more RNA, your results must show that comparison clearly, with appropriate controls and statistical analysis. If the sentence does not match your data, revise it. You may need to narrow the claim, change the comparison, or acknowledge a limitation. For example, if your new method recovers more RNA only in one tissue type, the sentence should say "from frozen liver tissue" instead of "from frozen tissue." This step connects to the broader principle of transparent reporting. The [EQUATOR Network](https://www.equator-network.org/) emphasizes that complete and transparent reporting allows readers to assess the reliability of research findings. Your poster's main message is a promise to the viewer. The rest of the poster must deliver on that promise with evidence. ### Step 3: Test the Sentence Against Your Audience Consider who will attend the conference or event. Are they specialists in your exact field, or are they a broader audience of life scientists? A sentence that works for specialists might confuse a general audience, and a sentence that works for a general audience might seem simplistic to specialists. For a specialist audience, you can use technical terms and assume background knowledge. For a general audience, you may need to define terms or frame the finding in terms of its broader significance. The sentence should be understandable to the least specialized person you expect to view your poster. ### Step 4: Shorten the Sentence A main message should be short enough to remember. Aim for a sentence that you can say in one breath, roughly 15 to 25 words. Shortening forces you to identify the essential elements and drop the rest. A refined sentence might read: "Our extraction method recovers 30% more RNA from frozen liver than the standard kit." This version names the method, the comparison, the sample type, and the magnitude of the effect. It is specific enough to be informative and short enough to remember. ### Step 5: Test the Sentence on a Colleague Ask a colleague who is not familiar with your project to read your sentence and tell you what they think your poster is about. If their summary matches your intent, the sentence works. If they focus on a different element or express confusion, revise the sentence. This test is a low-cost way to catch problems before you invest time in poster design. It also prepares you for the questions viewers will ask during the poster session. ## From Main Message to Poster Structure Once you have defined your main message, you use it to make decisions about every section of the poster. The main message is not a section of the poster. It is the organizing principle that determines what goes into each section and what gets left out. ### Title The title is the first element a viewer reads. It should state the main message or at least point directly to it. A title that names your finding is more effective than a title that only names your topic. For example, "Higher RNA Recovery from Frozen Liver with a Modified Extraction Method" tells the viewer what the poster claims. A title like "Evaluation of RNA Extraction Methods" leaves the viewer guessing. The title should be readable from a distance of several feet. Use a large font and keep the title to one or two lines. Avoid jargon and abbreviations that a viewer might not recognize. ### Background and Objective The background section exists to give the viewer just enough context to understand why your main message matters. It should not be a full literature review. Two or three sentences that establish the problem and the gap in knowledge are usually sufficient. The objective should state what your study did. It should connect directly to the main message. If your main message is about RNA recovery, the objective should say that you compared extraction methods for frozen liver tissue. The objective and the main message should be clearly linked. ### Methods The methods section should include only the details a viewer needs to evaluate your main message. If your main message is a comparison of two methods, the methods must describe both methods, the sample type, the sample size, and the outcome measure. Details that do not affect the interpretation of the main message can be omitted or summarized. A common mistake is to include every procedural detail from your lab notebook. Viewers do not need to know the exact centrifuge speed unless it affects the result. They need to know what you did well enough to judge whether your conclusion is credible. ### Results The results section is where you present the evidence that supports your main message. Every figure and table in this section should serve the main message. If a figure does not support the main message, consider removing it or moving it to a supplementary handout. Figures should be designed for quick comprehension. Each figure should have a clear title that states what it shows, labeled axes, and a legend that explains the key features. A viewer should be able to understand the figure without reading the methods section. ### Conclusion The conclusion should restate the main message in slightly different words and add one sentence about its significance. This is not the place to introduce new information. If the viewer remembers only one thing from your poster, it should be the conclusion. ### Acknowledgments and References Acknowledge funding sources, mentors, and collaborators as required by your institution or the conference. Include references only for the key claims in your background section. A poster is not a journal article, and a long reference list consumes space that could serve the main message. ## At a Glance: Main Message Decision Table | Decision Point | Question to Ask | Action If the Answer Is No | | --- | --- | --- | | Data support | Does my data directly support the sentence I wrote? | Revise the sentence to match the data or collect additional evidence before presenting | | Audience fit | Will the intended viewers understand this sentence without lengthy explanation? | Rewrite the sentence using plainer language or define key terms in the background | | Specificity | Does the sentence name the comparison, sample, and outcome instead of a general topic? | Add the missing specific elements and remove vague wording | | Memorability | Can I say the sentence in one breath and would a colleague recall it after one reading? | Shorten the sentence and remove secondary clauses | | Uniqueness | Does this sentence state what my study contributes instead of what is already known? | Reframe the sentence around your specific finding instead of general background | ## Practical Workflow for Defining Your Main Message The following workflow takes you from a vague sense of your study's importance to a defined main message that you can use to design your poster. ### Step 1: List Your Findings Write down every result your study produced. Include findings that seemed minor at the time. This list is your raw material. It should include both positive and negative results, because a null result can be a main message if it contradicts a widely held assumption. ### Step 2: Rank the Findings Rank the findings by importance. Consider three criteria: significance to the field, novelty, and relevance to the conference audience. Significance means the finding changes how researchers think about a problem. Novelty means the finding is not already known. Relevance means the finding matters to the people who will view your poster. This ranking is a professional judgment. Discuss it with your mentor or a trusted colleague. They may see importance in a finding that you have overlooked, or they may help you recognize that a finding you value is already well established. ### Step 3: Draft One Sentence for the Top Finding Use the one-sentence takeaway exercise to draft a sentence for your top-ranked finding. Do not try to include your second or third findings in this sentence. The sentence should state only the single most important result. ### Step 4: Test and Revise Test the sentence against your data, your audience, and your colleagues. Revise until the sentence is accurate, understandable, and memorable. This step may take several rounds. Each revision should make the sentence clearer or more specific. ### Step 5: Record the Sentence Write the final sentence at the top of your poster planning document. Refer to it as you design each section. If a section does not serve the sentence, revise the section or remove it. ## Records and Measurements for Poster Development Keep a planning document that records your decisions about the main message. This document is useful when you present the same study at multiple events or when you convert the poster into a paper or presentation. | Record Item | What to Document | Why It Matters | | --- | --- | --- | | Main message sentence | The final version of your one-sentence takeaway | Provides the organizing principle for the poster and any future presentations | | Audience notes | The conference name, expected attendees, and their specialty level | Explains why you chose a particular framing for the message | | Data support check | The specific figure or table that supports the main message | Ensures the poster delivers on the promise made in the title and conclusion | | Revision history | Each draft of the main message and the reason for the change | Shows how your thinking evolved and helps you avoid repeating rejected framings | | Colleague feedback | Summaries of what colleagues said after reading your sentence | Provides evidence that the message is understandable to an outside reader | ## Common Failure Patterns in Defining a Main Message Researchers encounter predictable problems when they try to define a main message. Recognizing these patterns helps you avoid them. ### The Kitchen Sink Poster The kitchen sink poster tries to present every finding from the study. The title is broad, the background covers the entire field, and the results section contains every figure the researcher produced. Viewers cannot identify the main message because the poster does not have one. The fix is to apply the one-sentence takeaway exercise and then remove any content that does not support the chosen sentence. This is difficult because it means discarding work you completed. The discipline is necessary for effective communication. ### The Methods-First Poster The methods-first poster spends most of its space on procedural details and leaves little room for results and interpretation. This pattern often appears when the researcher is proud of the technical work and assumes viewers will share that interest. The fix is to remember that viewers come to a poster session to learn about findings. Methods matter only to the extent that they support the credibility of the findings. Reduce the methods section to the essential details and expand the results and conclusion. ### The Vague Message The vague message poster has a title like "A Study of RNA Extraction Methods" and a conclusion that says "Our results suggest that extraction methods affect RNA quality." This poster states the obvious and gives the viewer no reason to remember it. The fix is to add specificity. Name the methods, the sample type, the outcome measure, and the direction and magnitude of the effect. A specific message is more informative and more memorable than a general one. ### The Audience Mismatch The audience mismatch occurs when the main message is framed for the wrong audience. A researcher presenting at a clinical conference uses a message that assumes deep molecular biology knowledge, or a researcher presenting at a basic science conference uses a message that is too applied. The fix is to research the conference before you write your main message. Look at the conference program from previous years, read the abstracts of accepted talks, and ask colleagues who have attended. Match your message to the audience you will actually face. ### The Unsupported Claim The unsupported claim occurs when the main message overstates what the data show. The researcher writes "Our method is superior to the standard kit" when the data show a modest improvement in one tissue type with a small sample size. The fix is to check every claim in your main message against your data. If the data do not support the claim, revise the claim. Overstating your results damages your credibility and invites difficult questions during the poster session. ## Welfare and Safety Context for Poster Content The content of your poster must meet the ethical standards that apply to the research itself. These standards are not optional, and they affect what you can claim and how you present your work. ### Research Integrity Your poster must accurately represent your study. This means you do not selectively report results that support your main message while hiding results that contradict it. The [Committee on Publication Ethics](https://publicationethics.org/core-practices) describes core practices that apply to all stages of research communication, including data management, authorship, and handling of misconduct. A poster is a form of research communication, and the same principles of honesty and transparency apply. If your study had limitations, you should acknowledge them on the poster or be prepared to discuss them when viewers ask questions. Acknowledging limitations does not weaken your main message. It strengthens your credibility. ### Data Management Your poster should be consistent with your study's data management plan. The [National Institutes of Health Data Management and Sharing Policy](https://sharing.nih.gov/data-management-and-sharing-policy) describes expectations for managing and sharing scientific data generated from NIH-funded research. Even if your study is not NIH-funded, the principle applies: you should know where your data are stored, how they are documented, and how they can be accessed if questions arise about your poster. Before you present a poster, confirm that your data are organized and that you can produce supporting materials if a viewer asks for them. This preparation is part of responsible research communication. ### Authorship and Acknowledgment The poster should list all contributors who meet the authorship criteria for your field. The [Committee on Publication Ethics](https://publicationethics.org/core-practices) addresses authorship practices, and the [ORCID for Researchers](https://info.orcid.org/researchers) page explains how researchers can maintain a record of their contributions. If you are unsure whether someone should be listed as an author or acknowledged in a footnote, discuss the question with your mentor or the principal investigator before the conference. ### Funding Disclosure If your research was funded by a grant, the poster should acknowledge the funding source. The [NIH Grants and Funding](https://grants.nih.gov/) pages describe the expectations for grant recipients, including proper acknowledgment of NIH support in publications and presentations. Your institution may have specific requirements for funding disclosure on posters. Check with your research office before you print. ## Limitations of the Main Message Approach The one-sentence takeaway exercise is a practical tool, but it has limitations that you should understand before you rely on it. ### It Does Not Replace Statistical Rigor A clear main message does not make weak data strong. If your study has a small sample size, lacks appropriate controls, or uses an inappropriate analysis, no amount of message refinement will fix those problems. The main message must be built on a foundation of sound study design and analysis. The [Research Methods Resources](https://www.ncbi.nlm.nih.gov/books) gateway from the National Library of Medicine provides access to authoritative texts on study design and research methods that can help you evaluate whether your study is sound. ### It Requires Professional Judgment The exercise guides your thinking, but it does not make the decision for you. Choosing the most important finding from a complex study requires judgment that comes from experience, knowledge of the literature, and consultation with mentors. If you are early in your career, seek feedback on your main message from more experienced researchers. ### It Is Audience Dependent A main message that works for one conference may not work for another. You may need to revise your message when you present the same study at a different event. This is normal and expected. The exercise should be repeated for each presentation. ### It Does Not Guarantee Viewer Attention Even a well-defined main message can fail to reach viewers if the poster is poorly designed, placed in a low-traffic area, or presented by someone who cannot discuss it effectively. The main message is necessary but not sufficient for a successful poster. ## Professional Escalation Criteria Some situations require you to seek help before you finalize your poster. Escalate to a mentor, principal investigator, or research integrity officer in the following circumstances. ### Disagreement About the Main Message If you and your mentor or collaborators cannot agree on the main message, do not resolve the disagreement by including multiple messages on the poster. Discuss the options with the research team and reach a consensus before you design the poster. If the disagreement persists, involve a senior researcher who can provide an outside perspective. ### Questions About Data Integrity If you discover that some of your data are missing, unrecorded, or questionable, stop and address the issue before you present. Presenting a poster that relies on unreliable data is a serious problem. The [Committee on Publication Ethics](https://publicationethics.org/core-practices) provides guidance on handling research misconduct and data problems. Your institution likely has a research integrity officer who can advise you. ### Uncertainty About Authorship If you are unsure who should be listed as an author on the poster, or if a collaborator disputes the authorship list, resolve the issue before the conference. Authorship disputes are easier to address before a poster is printed than after. Consult your institution's authorship policy or the [Committee on Publication Ethics](https://publicationethics.org/core-practices) guidance. ### Funding Disclosure Requirements If you are uncertain whether your poster must include a specific funding acknowledgment, check with your institutional research office or grants administrator. The [NIH Grants and Funding](https://grants.nih.gov/) pages describe the general expectations for NIH grantees, but your institution may have additional requirements. ## Frequently Asked Questions ### How long should my main message sentence be? Aim for a sentence you can say in one breath, roughly 15 to 25 words. The sentence should name your finding, the comparison or context, and the outcome. If the sentence is longer, look for secondary clauses that can be moved to the background or results sections. ### Can I have more than one main message on my poster? You can, but you should not. A poster with multiple main messages forces the viewer to divide attention, and the result is that no message lands clearly. If your study produced several important findings, choose the one that matters most to the specific conference audience and present the others as supporting context or in a handout. ### What if my study produced a null result? A null result can be a strong main message if it contradicts a widely held assumption or fills a gap in the literature. Frame the message around what you found and why it matters. For example, "Our trial found no difference in survival between treatment A and treatment B, suggesting the current preference for A should be reconsidered." ### How do I choose between two equally important findings? Discuss the choice with your mentor or collaborators. Consider which finding is more novel, which is more relevant to the conference audience, and which is better supported by your data. If both findings are genuinely important, consider presenting the study at two different conferences with a different main message for each. ### Should the main message appear in my abstract? Yes. The abstract and the poster should tell the same story. If the abstract states one main message and the poster states another, reviewers and viewers will be confused. Write the abstract after you have defined the main message so the two documents are consistent. ### How do I handle a main message that is too technical for a general audience? Define the key terms in your background section or use a more accessible framing in the title and conclusion. You can keep the technical detail in the methods and results sections for the specialists who want it, while the title and conclusion state the finding in plainer language. ### What should I do if a colleague disagrees with my main message? Listen to the objection and ask for the reasoning. The colleague may have noticed that your data do not support the claim, or they may see a different finding as more significant. Use the feedback to revise your sentence. If the disagreement persists, involve your mentor or principal investigator. ### How early should I define my main message? Define the main message before you start designing the poster layout. The message determines which figures to include, how much background to write, and how to structure the conclusion. Starting the design without a defined message leads to a cluttered poster that is difficult to fix later. ## Related Articles - [Scientific Posters: Designing a Figure-First Research Narrative](/blog/careers/scientific-posters-designing-a-figure-first-research-narrative) - [Protein Synthesis Step By Step](/blog/guides/protein-synthesis-step-by-step) - [Epidemiological Study Designs: An Overview for Researchers](/blog/guides/epidemiological-study-designs-an-overview-for-researchers) - [Protein Synthesis: A Step-by-Step Guide to Transcription and Translation](/blog/guides/protein-synthesis-a-step-by-step-guide-to-transcription-and-translation) - [Scientific Literature Review Format: A Reproducible Structure for Researchers](/blog/careers/scientific-literature-review-format-a-reproducible-structure-for-researchers) ## References and Further Reading - [Research Methods Resources](https://www.ncbi.nlm.nih.gov/books). National Library of Medicine. - [EQUATOR Network](https://www.equator-network.org/). EQUATOR Network. - [Core Practices](https://publicationethics.org/core-practices). Committee on Publication Ethics. - [NIH Grants and Funding](https://grants.nih.gov/). National Institutes of Health. - [ORCID for Researchers](https://info.orcid.org/researchers). ORCID. - [Data Management and Sharing Policy](https://sharing.nih.gov/data-management-and-sharing-policy). National Institutes of Health. - [NCBI Literature Resources](https://www.ncbi.nlm.nih.gov/). National Center for Biotechnology Information. - [PubMed](https://pubmed.ncbi.nlm.nih.gov/). National Library of Medicine. > This article is educational and does not replace institutional policy, professional advice, or applicable safety and regulatory requirements.