Making Participant Information Sheets Clearer and More Useful

There’s a quiet tension in clinical research. The participant information sheet (PIS) is one of the most important documents in any study. It is also one of the most likely to be skimmed or misunderstood.

Ethics committees require them. Participants receive them. But how much of the content is absorbed, and how much of it genuinely informs consent?

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Why PIS Readability Matters

The PIS is often a participant’s first real impression of a study. If it is too long, full of medical jargon, or formatted like a contract, the effect is not just confusion. It is discouragement.

In digital trials, where participants might receive everything by email or through an app, there is often no face-to-face explanation to fill the gaps. That makes clarity on the page or screen even more important.

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Common Pitfalls

• Overly technical language. “Adverse event” might be clear to a regulator but not necessarily to a 20-year-old student joining a probiotic study.
• Dense blocks of text. Long paragraphs with no visual breaks can be off-putting.
• Assuming familiarity. References to study procedures without explanation, such as “You will complete a 24-hour recall on Day 7,” assume more context than many participants have.

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What Helps

• Chunking. Break text into manageable sections with descriptive headings.
• Layered detail. Provide an overview first. Offer deeper explanations through expandable text or separate links.
• Plain language. Write like you're explaining it to a smart non-expert. That is often who is reading.
• Visual aids. Timelines, flowcharts, and icons can make the structure of the study clearer than text alone.

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Digital-Specific Considerations

When delivering a PIS through a participant portal or app:

• Make sure it is mobile-friendly. No one wants to scroll through a full PDF on a phone.
• Track time spent reading as an engagement signal. The goal is not judgment but understanding how people interact with the content.
• Consider progressive disclosure. Show only a few sections at a time so readers are not overwhelmed.

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What This Means in Practice

Some participants read the PIS carefully. Others skim. A few ignore it entirely and just click “next.” But a well-written, well-formatted PIS increases the chances of genuine understanding.

That understanding is not just about compliance. It forms the foundation of ethical research, especially when participation is remote and trust has to be built through screens.

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