Voice User Interface (VUI) design is at the forefront of creating accessible, intuitive, and efficient user experiences. With the rise of smart speakers, voice assistants, and other voice-activated technologies, the importance of well-designed VUIs cannot be overstated.
This article explores the best practices in VUI design, underlining each with examples from leading companies and applications that have excelled in creating remarkable voice-driven experiences.
Understanding User Needs and Context
Best Practice: As with most UX and UI design, designers should start by deeply understanding the user's needs, preferences, and the context in which they will be interacting with your VUI. This includes recognizing the user's environment, tasks they are looking to accomplish, and any limitations they might face.
Example: Amazon's Alexa is designed with a deep understanding of user contexts. Whether users are in the kitchen needing a timer, in the living room wanting to play music, or in the bedroom setting an alarm, Alexa provides relevant responses and actions based on where it is used and what the user is likely trying to do.
Simplifying Interactions
Best Practice: Simplifying interactions in Voice User Interface (VUI) design is all about reducing the cognitive load on users, enabling them to accomplish tasks with minimal effort using natural, intuitive voice commands. Keep voice commands simple and intuitive. Users should be able to interact with your VUI without having to remember specific commands.
Example: Domino's Pizza introduced a voice ordering feature through its app and integration with voice assistants like Alexa. Customers can order their favorite pizza by simply saying, "Order my usual from Domino's" or "Ask Domino’s to deliver a large pepperoni pizza." This simplifies the pizza ordering process, making it quicker and more enjoyable for users who can place an order without browsing through the menu.
Handling Errors Gracefully
Best Practice: Effective error handling in VUI design is critical for maintaining a positive user experience. When misunderstandings or misrecognition occur, the VUI should proactively assist the user towards a successful outcome. This can be achieved by offering alternative suggestions, asking for clarification, or providing additional guidance.
Example: Microsoft's Cortana is designed to handle errors gracefully by asking clarifying questions or suggesting alternatives when it doesn't understand a command. If a user's request is unclear or ambiguous, Cortana might say, "I'm not sure what you meant by that. Did you mean...?" and provide a list of potential matches or follow-up questions to narrow down the user's intent.