Respect the user's attention

Why this rule exists

Attention is the one resource the user brings that you cannot manufacture and can only spend or squander, and every element, animation, notification, and interruption draws on that finite supply. Design that treats attention as free, an autoplay here, a badge there, a modal that interrupts, a banner that persists, accumulates into an experience that feels exhausting and adversarial even when each individual piece seemed harmless. The most respectful thing an interface can do is take only the attention it needs and give the rest back, staying quiet when it has nothing important to say and speaking clearly when it does. This restraint runs against many commercial incentives, which push toward grabbing more attention, more engagement, more time, but the products people genuinely trust are the ones that do not treat them as a resource to be extracted. Every rule in this book ultimately serves this one: hierarchy, clarity, restraint, and feedback all exist so the user can accomplish what they came for and get on with their life, having spent no more of their limited attention than the task honestly required.