We discuss a case study where this technique was used in the design of an ambient intelligence system, highlighting how it impacted the design process both in positive and negative ways. This contextu-alized account complements related comparative studies that have been conducted outside the context of a design project, and have focused on methodological aspects of video prototyping. We conclude that designers need to be aware of how video as a persuasive medium obfuscates implementation and usability issues, and video prototype production should communicate explicitly the scope of the design issues that it addresses and those it does not.
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