An adjustable sample size estimation model for usability assessment

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Abstract

Usability assessment plays a fundamental role in discovering usability problems and the determination of the level of usability for a given software product. One crucial aspect in every usability assessment is the estimation of the sample size desired for a software product. Once we start estimating the sample size needed for a usability assessment, a baffling question comes in mind: "how many users are enough for a given software product?". To the best of our knowledge, the majority of existing models estimates the sample size needed for a usability assessment, based on historical data. A better estimation should be based on both historical data, which provide an initial idea from previous software products and based on present data, which provide a practical idea for a given software product. Therefore, in this paper we have proposed an adjustable sample size estimation model for usability assessment, which enhances the estimation process by using two factors: Alpha factor (α), which estimates the problem discovery rate (λα) from historical data and the Beta factor (β), which estimates the problem discovery rate (λβ) by using the complexity of the software product. λβ is taken as vertical and domain wise for a given software product, to adjust the alpha factor appropriately to give the desired confidence level in the results. An illustrative case study has been provided at the end of the paper. [ABSTRACT FROM AUTHOR] Copyright of American Journal of Applied Sciences is the property of Science Publications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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APA

Jabbar, H. S., Gopal, T. V., & Aboud, S. J. (2007). An adjustable sample size estimation model for usability assessment. American Journal of Applied Sciences, 4(8), 525–532. https://doi.org/10.3844/ajassp.2007.525.532

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