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In this paper, we describe Iterative Development in the Field (IDF), a User-Centered Design approach for developing interactive applications. This approach is characterized by repeated evaluation and redesign cycles that are carried out throughout the product life cycle, from initial discovery and gathering of requirements to beyond deployment in the field. The evaluation is based on the use of interactive prototypes and is performed by actual users in the field. We describe how IDF has evolved over the past 13 years through the experience gained from four major projects and offer a set of guidelines for successful IDF that we illustrate with examples from our experience. We discuss limitations in the applicability of IDF and conclude with some comments regarding the future of IDF.
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