A voice user interface enables interaction with technology through spoken language rather than visual elements or physical controls. VUI design principles guide creation of effective voice experiences.
What makes VUI different from visual interfaces?
Voice is linear and temporal. Users cannot scan options like on a screen. Memory load is high since users must remember what was said. Feedback is auditory. These constraints require different design approaches: shorter option lists, frequent confirmation, clear signposting of conversation state.
Why does VUI design matter?
Poorly designed VUI frustrates users quickly. Without visual cues, users easily become lost or confused. Good VUI design accounts for the medium’s constraints and leverages its advantages: natural language input, hands-free operation, and accessibility for users who cannot use visual interfaces.
VUI design in practice
A VUI designer reduces a 7-option menu to 3 top choices with an “other” option for natural language input. They add explicit state markers (“Now I’ll ask about your insurance”) and confirmation summaries. User testing shows significantly improved task completion and satisfaction compared to the original design.