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Abstract. This article aims to present the method of usability evaluation called Scenario and Task Based Interviews (STBI). The method was proposed to add flexibility to field usability testing, so that they could be applied to the context of The Brazilian Institute of Geography and Statistics (IBGE). IBGE is the institute of Brazilian central Administration that performs the Census and other important official demographic and economic data collection. This evaluation technique was specifically designed to be implemented with the participation of interviewers who use PDA (personal digital assistants) to perform data collection for statistical research in Brazil. The authors analyzed the usability of the application developed for PDA to support the Continuous National Household Sample Survey (Continuous PNAD). The method proposed in this paper represented a mix of four approaches to usability evaluation.
Keywords: usability, PDA, method, data collection, interaction design,