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Abstract.A human-computer interface interposes objects between a person and the underlying representation with which the person interacts. Previously, we introduced two interaction objects, alternatives and their collections in an interactive design gallery. We revisit the terms, refining their definitions, and introduce the explicit notion of a "view" to accommodate multiple references to the same alternative or collection in an interface. We outline fundamental interactions over alternative and collection views. Finally, we outline a special type of collection called the Parallel Coordinate View.

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