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Software visualization for end-user programmers is a relatively unexplored opportunity area. There are advances in software visualization research pertinent to this, but the adoption stage has been entirely ignored. In this paper, we focus on a popular facilitator of adoption decisions: the free trial period. We conducted a case study of an end-user programmer (an accountant) in this situation, as she tried out a commercial spreadsheet visualization tool to make an adoption decision. The results have implications for both theory and design, revealing open questions, design opportunities, and strengths and weaknesses of theoretical foundations.

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