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Key Points from the Chapter > Key Points from the Chapter - Pg. 232

232 CHAPTER 8 Standardized Usability Questionnaires Table 8.8 TAM Perceived Usefulness and Perceived Ease-of-use Items Perceived Usefulness Using [this product] in my job would enable me to accomplish tasks more quickly. Using [this product] would improve my job performance. Using [this product] in my job would increase my productivity. Using [this product] would enhance my effectiveness on the job. Using [this product] would make it easier to do my job. I would find [this product] useful in my job. Perceived Ease of Use Learning to operate [this product] would be easy for me. I would find it easy to get [this product] to do what I want it to do. My interaction with [this product] would be clear and understandable. I would find [this product] to be flexible to interact with. It would be easy for me to become skillful at using [this product]. I would find [this product] easy to use. KEY POINTS FROM THE CHAPTER · · · · · · · · · · · · This chapter contains descriptions of 24 standardized questionnaires designed to assess perceptions of usability or related constructs (e.g., satisfaction or usefulness). Those questionnaires fall into four broad categories: poststudy, post-task, website, and other. Standardized poststudy questionnaires include the QUIS, SUMI, PSSUQ, SUS, USE, and UMUX. Standardized post-task questionnaires include the ASQ, ER, SEQ, SMEQ, and UME. All of these poststudy and post-task questionnaires are of potential value to usability practitioners due to psychometric qualification indicating significant reliability, validity, and sensitivity. Head-to-head comparisons of the methods indicate that the most sensitive poststudy questionnaire is the SUS, followed by the PSSUQ; the most sensitive post-task questionnaire is the SMEQ, followed by the SEQ. Due to their growing use for commercial transactions, standardized usability questionnaires for websites include items focused on the assessment of attributes such as trust and service quality. Recent research indicates that the common practice of mixing the tone (positive and negative) of items in standardized usability questionnaires is more likely to harm rather than benefit the quality of measurement. Recent research also indicates that minor adjustments to the wording of items in standardized usability questionnaires does not appear to have an effect on the resulting scores (but extreme changes can affect the resulting metrics). The scores from standardized usability measurements do not have any inherent meaning, but they are useful for comparisons, either between products or conditions in usability studies or against normative databases. Commercial usability questionnaires that provide comparison with normative databases are the SUMI, WAMMI, and SUPR-Q. For noncommercial usability questionnaires, some normative information in the public domain is available for the PSSUQ and CSUQ (Lewis, 2002) and researchers have recently published norms for the SUS (Bangor et al., 2008, 2009; Sauro, 2011a).