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Some analyses are presented of talk between designers and a potential user in a participatory design session where a prototype application was worked with to determine future requirements. We explore the ways in which design suggestions are formulated and argued for, and how requirements emerge as a negotiated product of interaction.On this basis, we re-examine user participation in design and the relationship between prototyping and user requirements. We conclude by offering a notion (gradients of resistance in design space) to help understanding the interplay of the social and the technical in design.Magic Lensm falters are anew user interface tQOl that combine an arbitrarly-shaped region with an operator that changes the view of objects viewed through that region, These tools can be interactively positioned over on-screen applications much as a magnifying glass is moved over a newspaper. This paper describes their advantages in more detail and illustrates them with examples of magic lens fiiters in use over a variety of applications. 221

Magic LensT'l filters area new user interface tool that combine an arbitrarily-shaped region with an operator that changes the view of objects viewed through that region.These tools can be interactively positioned over on-screen applications much as a magnifying glass is moved over a newspaper.

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