This article builds up on the previous research by Suh et al. (2008). It begins with a definition of mobile devices and a review of the usability literature. A basic definition for Usability of Mobile Devices (PUMD) is then presented and followed by a discussion of the scale develop-mentprocess. Continuing Suh et al.'s (2008)'s basic scale development, two subsequent studies that were undertaken and added. Our first study, utilizing a set of 200 subjects, employs a complementary tool, Bayesian Network (BN), to revalidate and expand the results from the previous validation of PUMD. Second study, utilizing a separate sample of 190 students, attempts to assess nomo-logical validity with a comparison of the final scale with other relevant marketing constructs.
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