Why Your Digital Trial Might Still Need Paper

It can feel almost wrong to say it. Paper, in a digital trial? After so much effort has gone into designing apps, eConsent flows, and cloud-based data capture systems? But yes, paper still has a role. Not always, and not for everything. But sometimes it is the simplest, most robust fallback there is.

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Start with the basics. Digital tools fail. Participants lose phones, forget passwords, or uninstall the app during a device update. Internet service can be patchy, particularly in rural areas or older buildings. Even a five-minute platform outage during a visit can stall a tightly run study.

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Paper doesn’t crash. It doesn’t need charging. It works offline, in low-resource settings, and in edge cases where digital tools aren’t practical.

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Here are some of the situations where paper might still be part of a well-run digital trial:

• A printed copy of the Participant Information Sheet mailed alongside login instructions for those uncomfortable reading long documents on a screen
• A paper backup of eConsent to use if the digital signature fails or if ethics committees require it
• A quick paper form used during site visits when tablets aren’t charged or Wi-Fi is down
• Handwritten notes kept by a participant who prefers to record thoughts on paper and submit them by photo later

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This is not about reverting to old ways. It is about building resilience into the system. If digital is Plan A, paper can be Plan B, available when needed but not the default.

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Some protocols even account for optional paper paths. A participant who misses three days of app-based entries might be sent a short paper diary with pre-paid return postage. A new participant who is hesitant about downloading the app can start with a paper screening form while support guides them through setup.

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Paper also allows for longer, more thoughtful responses. In some studies, free-text reflections, symptom narratives or food logs are more easily expressed in handwriting. Participants might annotate their food packaging or medication blister packs. While these inputs eventually need to be digitised, they often offer richer context.

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From a compliance perspective, paper introduces complexity. Transcription becomes a risk. Timeliness may suffer. But when handled intentionally and with proper audit trails, it offers a valuable fallback for capturing data that might otherwise be lost.

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Even at the site level, some teams still prefer to print visit schedules, participant task lists or protocol summaries. These get pinned to clinic walls, carried in coat pockets, and used in the moment. Sometimes the fastest way to remember a detail is to glance at a clipboard.

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If the study depends on accurate, complete data from a range of participants across diverse settings, then the tools should reflect that diversity. And in some cases, that means offering a pen and paper as one more way to participate.

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Digital trials are not made weaker by the presence of paper. They are made stronger by the inclusion of a practical, human-friendly backup.

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