Wizard Of Oz Prototype
What is a Wizard of Oz Prototype?
A Wizard of Oz prototype is a user research technique where participants interact with what they believe to be a fully functional system, but in reality, a human operator is simulating the system's responses behind the scenes.
Synonyms: WOz prototyping, human-assisted prototype, simulated system testing, fake-functionality prototype

How Wizard of Oz Prototypes Work
Wizard of Oz prototyping involves creating an illusion of a fully functional system or product. Users interact with an interface that appears complete, but their inputs are actually processed by a hidden human operator. This operator, often referred to as the "wizard," provides real-time responses to user actions, simulating the system's behavior.
Benefits of Wizard of Oz Prototyping
- Cost-effective: It allows testing complex functionalities without expensive development.
- Flexible: Researchers can quickly adjust responses based on user interactions.
- Early feedback: Gather user insights before full implementation.
- Explore AI and voice interfaces: Ideal for testing conversational UI and AI-driven systems.
When to Use Wizard of Oz Prototypes
Wizard of Oz prototypes are particularly useful in the following scenarios:
- Testing voice-activated systems
- Exploring AI-driven interfaces
- Evaluating complex algorithms
- Validating concepts for innovative products
Frequently Asked Questions
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Question 1: How does a Wizard of Oz prototype differ from a regular prototype? Answer: A Wizard of Oz prototype simulates functionality through human intervention, while a regular prototype typically has built-in, albeit limited, functionality.
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Question 2: Is Wizard of Oz prototyping ethical? Answer: It can be ethical if participants are informed about the simulation after the test and their data is handled responsibly.
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Question 3: What skills are needed to conduct a Wizard of Oz prototype test? Answer: Key skills include quick thinking, attention to detail, and the ability to consistently simulate system behavior.