Gabriele Umbriaco

tips for effective PowerPoint presentations

Tips for Preparing Effective Scientific Presentations

Structure of the presentation

• Clearly define the main message of the presentation. Every talk should answer a specific scientific question.

• Organize slides as a scientific narrative, following a logical structure: motivation → background/state of the art → method → results → conclusions.

• Limit the number of slides. For a 15-minute presentation, 12–15 slides are usually sufficient.

• Use informative slide titles that summarize the key point of the slide (avoid generic titles such as “Results”).

Clarity and readability

• Use large, readable fonts. Recommended sizes: at least 28 pt for text and 40 pt for titles.

• Minimize text. Prefer short bullet points instead of long sentences.

• Each slide should communicate one main idea.

• Use simple backgrounds and high contrast between text and background.

• Avoid unnecessary visual effects or animations, which may distract from the scientific content.

Effective use of figures

• Prefer figures and diagrams over text. In astrophysics, visualizations often communicate results more effectively than paragraphs.

• Ensure that axes and labels are clearly readable.

• Avoid overly complex plots with too many curves or elements.

• Use distinguishable colors, considering accessibility for color-vision deficiencies.

• Include a short explanation or takeaway message with each figure.

Communicating during the talk

• Slides are a support to the presentation, not the script of the talk.

• Guide the audience through each figure, explaining how to read the plot step by step.

• Manage time carefully, allocating more time to the key scientific results.

• Always conclude with a summary slide, highlighting the main findings and possible future developments.

Common mistakes to avoid

• Including too much text in slides.

• Using plots with very small labels or legends.

• Presenting too many results in a single slide without a clear visual hierarchy.

• Relying on slides instead of developing a clear scientific narrative.