A checkbox was breaking my client's therapy app. Here's why. The client approached me with a design challenge their UX team had flagged. In their research they discovered users kept hesitating on a specific page, not being able to complet the task they designed. The screens they shared looked fine. Clean layout, clear list, simple interaction. The problem wasn't visual. It was affordance. A checkbox carries a specific meaning people learned over decades of using digital devices: mark as done, task complete, move on. But this wasn't the goal of the component. The goal was to help users bring a specific topic to their next session. We replaced the checkbox with a pill button that said: "Bring to session." Same data. Similar look. Completely different mental model. Users can now complete the task.