Reliability and validity of the mobile phone usability questionnaire (MPUQ)

Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Copyright 2005, UPA. Vol. 2, Issue 1, November 2006, pp. 39-53 This study was a follow-up to determine the psychometric quality of the usability questionnaire items derived from a previous study (Ryu and Smith-Jackson, 2005), and to find a subset of items that represents a higher measure of reliability and validity. To evaluate the items, the questionnaire was administered to a representative sample involving approximately 300 participants. The findings revealed a six-factor structure, including (1) Ease of learning and use, (2) Assistance with operation and problem solving, (3) Emotional aspect and multimedia capabilities, (4) Commands and minimal memory load, (5) Efficiency and control, and (6) Typical tasks for mobile phones. The appropriate 72 items constituted the Mobile Phone Usability Questionnaire (MPUQ), which evaluates the usability of mobile phones for the purpose of making decisions among competing variations in the end-user market, determining alternatives of prototypes during the development process, and evolving versions during an iterative design process. Keywords usability, mobile user interface, questionnaire, reliability, validity