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Decision tree
Poster, E-Poster or Oral Presentation? A Decision Tree for Choosing Your Conference Format
How the three formats compare, who decides, and a two-step decision tree for the preference to state on your abstract form.
- Poster preparation
- Conference presentation
- E-poster
- Who decides
- Usually the committee
- Oral
- Broad audience, strict time
- Poster
- One-to-one discussion
- E-poster
- Often required as well
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Quick answer
- Choose oral for one take-home message to a large audience, poster for detailed one-to-one discussion and e-poster for online visibility.
- The committee usually assigns the final format; your choice is the preference you state on the abstract form.
- Check attendance rules first: some congresses require the presenter onsite, and some require an e-poster as well as a paper poster.
Overview
The oral vs poster presentation choice shapes how many people see your work, how you interact with them and how much preparation you need. Usually the congress decides after review, but many abstract forms ask you to state a preference, and some formats depend on whether you can attend in person. A good choice starts with the goal of the presentation and the congress rules.
This guide compares the three formats, shows who usually decides, and gives a decision tree for choosing your conference presentation format. For poster design and printing support, see our poster preparation service.
The Three Formats Compared
Table 1. Comparison of poster, e-poster and oral formats (general characteristics; congress rules vary)
| Format | What it is | Strengths | Limits |
|---|---|---|---|
| Paper poster presentation | A large visual display of findings with just enough text for context, interpretation and conclusions1 | Supports one-to-one conversation and detailed discussion; a poster presentation should be a two-way process2 | Needs printing and travel; layout must fit the board size; in one study fewer than 5% of delegates visited the posters2 |
| E-poster | A digital poster shown on screens or an online platform; some congresses require it alongside the paper poster34 | Remains discoverable online; ECR keeps EPOS posters as permanent records with a DOI5 | File-size and format limits; a moderated e-poster may be limited to a single PDF page (ACNAP 2026: one page, landscape 16:9)7 |
| Oral presentation | A time-limited talk to a seated audience | Reaches a larger audience at once with a clear take-home message2 | Strict time limit and slide limits (ACNAP 2026 oral abstract sessions: six slides at most)7; less room for detail; usually allocated by the committee |
Who Decides the Format?
Check whether you choose or the committee assigns. At ECNP 2026, abstracts accepted for poster presentation received an outcome of poster or ePoster, and changing the registration type changed the type of poster presentation8. At ECR 2026, a poster could not be delivered as an oral presentation unless it took part in EPOS PULSE6. Attendance can also decide: ESMO 2026 requested the presenting author onsite3, and the NEI Spring Congress 2026 did not accept virtual presentations9.
Preparing a congress poster or presentation?
Pubrica’s designers and medical writers prepare posters, e-posters and slide decks to each congress’s specifications, checked against the abstract and the congress rules. Presenting authors keep control of the content and any disclosures.
Decision Tree: Which Format Should You Choose?
The tree has two steps. Step A helps you decide which preference to state on the abstract form. Step B applies after review, because the committee usually allocates the final format.
Table 2. Step A, at abstract submission: which format preference to state
| # | Question | If YES | If NO |
|---|---|---|---|
| 1 | Can the presenting author attend onsite? | Go to question 2 | Check whether a co-author can present (ESMO 2026 allowed this)3 or whether an online ePoster registration exists (as at ECNP 2026)8; if neither, consider another congress |
| 2 | Is your goal a single take-home message for a large audience in a fixed time slot? | State oral presentation as your preference, if the form offers one | Go to question 3 |
| 3 | Is your work detailed (methods, tables, several figures) and best discussed one-to-one? | State poster as your preference | Go to question 4 |
| 4 | Do you want the work to stay visible online after the meeting? | Choose a congress that publishes posters online (such as ECR’s EPOS) or state e-poster, if offered5 | State poster as your preference |
Step B, after review: follow the format the committee assigns and prepare for it. If you are given a poster, check whether the congress also requires an e-poster: ESMO 2026 and ESGO 2026 required both34.
Preparing for Each Format
- Poster: design to the board size (see our scientific poster size guide), keep text light and figures large; delegates favoured posters with fewer words per square metre2.
- E-poster: follow the file format, size and page limits57.
- Oral: write for the time slot and slide limit, build one take-home message and rehearse to time.
- All formats: check the congress rules on AI use and disclosure before preparing materials; see our guide to AI-generated figures and text on posters.
Common Mistakes When Choosing a Format
- Choosing oral only for prestige when the work needs detailed discussion.
- Missing the requirement to register or attend onsite39.
- Ignoring that registration type can change the poster type8.
- Preparing a paper poster but forgetting the mandatory e-poster34.
- Reusing slides as a poster, or the reverse, without redesigning.
Conclusion
Start with the congress rules, then match the format to your goal: oral for a broad take-home message, poster for detailed one-to-one discussion and e-poster for continued visibility. Confirm attendance and file requirements before you submit, and use the decision tree above to decide which preference to state.
Pubrica team verdict
State the preference that matches your goal, then prepare for whatever the committee assigns, including any mandatory e-poster.
Frequently asked questions
Sources
Sources were checked on 12 November 2026. Requirements and guidance may change after that date; confirm the current version with the issuing body.
- 1Hess, G. R., Tosney, K. W., & Liegel, L. H. (2009). Creating effective poster presentations: AMEE Guide no. 40. Medical Teacher, 31(4), 319–321. https://doi.org/10.1080/01421590902825131
- 2Goodhand, J. R., Giles, C. L., Wahed, M., Irving, P. M., Langmead, L., & Rampton, D. S. (2011). Poster presentations at medical conferences: An effective way of disseminating research? Clinical Medicine, 11(2), 138–141. https://doi.org/10.7861/clinmedicine.11-2-138
- 3European Society for Medical Oncology. (2026). ESMO Congress 2026: Poster presenters instructions. https://dam.esmo.org/image/upload/v1783425264/ESMO-Congress-2026-Poster-Presenters-Instructions_j108ee.pdf
- 4European Society of Gynaecological Oncology. (n.d.). Poster, ePoster and video instructions for presenting authors. Retrieved November 13, 2026, from https://congress.esgo.org/programme/poster-video-instructions/
- 5European Society of Radiology. (2023). EPOS poster guidelines. https://www.myesr.org/app/uploads/2023/12/Poster-upload-guidelines.pdf
- 6European Society of Radiology. (n.d.). ECR 2026: Poster upload (EPOS™). Retrieved November 9, 2026 (page no longer online), from https://app.myesr.org/congress/submit/poster-upload/
- 7European Society of Cardiology. (n.d.). ACNAP 2026: Presenter guidelines. Retrieved November 13, 2026, from https://www.escardio.org/events/congresses/acnap-congress/scientific-programme/faculty-presenters/presenter-guidelines/
- 8European College of Neuropsychopharmacology. (n.d.). ECNP Congress 2026: Abstract submission, review and AI policy. Retrieved November 9, 2026, from https://www.ecnp.eu/congress2026/abstract/
- 9Neuroscience Education Institute. (2026). 2026 NEI Spring Congress: Scientific poster guidelines. https://cdn.neiglobal.com/content/congresssp/2026/pdf/26cngsp-poster-guidelines-web.pdf
oral vs poster presentationposter presentatione-posteroral presentationconference presentation formatdecision tree
How to cite this article
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Dr. Charlie. (2026, November 12). Poster, E-Poster or Oral Presentation? A Decision Tree for Choosing Your Conference Format. Pubrica. https://pubrica.com/insights/poster-preparation/poster-e-poster-or-oral-presentation/
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Next steps
Preparing a congress poster or presentation?
Pubrica’s designers and medical writers prepare posters, e-posters and slide decks to each congress’s specifications, checked against the abstract and the congress rules. Presenting authors keep control of the content and any disclosures.
This article is general information for researchers, not legal, regulatory or funding advice. Check the current requirements of your journal, funder, ethics committee or regulator before you act on it.
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