Interaction Design is the creation of a dialogue between a person and a product, service, or system. This dialogue is usually nearly invisible and found in the minutiae of daily life—the way someone may hold his knife and fork while cutting into a steak or the way another person may automatically switch windows to check her Facebook wall every few minutes or so. Structuring this form of ethereal dialogue is difficult, as it occurs in a fourth dimension—over time. To design for behavior requires an understanding of the fluidity of natural dialogue, which is both reactionary and anticipatory at the same time. Common metrics for evaluating Interaction Design track the ease of use one has with negotiating an interface, yet usability ...

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