Deborah E. Maher’s research while affiliated with The Cambridge Group and other places

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Publications (3)


Investigating the Correspondence Between UMUX-LITE and SUS Scores
  • Conference Paper
  • Full-text available

August 2015

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1,133 Reads

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27 Citations

Lecture Notes in Computer Science

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Brian S. Utesch

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Deborah E. Maher

The UMUX-LITE is a two-item questionnaire that assesses perceived usability. In previous research it correlated highly with the System Usability Scale (SUS) and, with appropriate adjustment using a regression formula, had close correspondence to the magnitude of SUS scores, enabling its comparison with emerging SUS norms. Those results, however, were based on the data used to compute the regression formula. In this paper we describe a study conducted to investigate the quality of the published formula using independent data. The formula worked well. As expected, the correlation between the SUS and UMUX-LITE was significant and substantial, and the overall mean difference between their scores was just 1.1, about 1 % of the range of values the questionnaires can take, verifying the efficacy of the regression formula.

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Correlations Among the Various Metrics
Predictions of Outcome Metrics Using Reliable and Responsive
Measuring Perceived Usability: The SUS, UMUX-LITE, and AltUsability

June 2015

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1,780 Reads

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104 Citations

The purpose of this research was to investigate various measurements of perceived usability, in particular, to assess (a) whether a regression formula developed previously to bring Usability Metric for User Experience LITE (UMUX-LITE) scores into correspondence with System Usability Scale (SUS) scores would continue to do so accurately with an independent set of data; (b) whether additional items covering concepts such as findability, reliability, responsiveness, perceived use by others, effectiveness, and visual appeal would be redundant with the construct of perceived usability or would align with other potential constructs; and (c) the dimensionality of the SUS as a function of self-reported frequency of use and expertise. Given the broad use of and emerging interpretative norms for the SUS, it was encouraging that the regression equation for the UMUX-LITE worked well with this independent set of data, although there is still a need to investigate its efficacy with a broader set of products and methods. Results from a series of principal components analyses indicated that most of the additional concepts, such as findability, familiarity, efficiency, control, and visual appeal covered the same statistical ground as the other more standard metrics for perceived usability. Two of the other items (Reliable and Responsive) made up a reliable construct named System Quality. None of the structural analyses of the SUS as a function of frequency of use or self-reported expertise produced the expected components, indicating the need for additional research in this area and a need to be cautious when using the Usable and Learnable components described in previous research.


Table 3 . Factor Analysis of the UMUX.
UMUX-LITE: when there's no time for the SUS

April 2013

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19,208 Reads

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244 Citations

In this paper we present the UMUX-LITE, a two-item questionnaire based on the Usability Metric for User Experience (UMUX) [6]. The UMUX-LITE items are This system's capabilities meet my requirements and This system is easy to use." Data from two independent surveys demonstrated adequate psychometric quality of the questionnaire. Estimates of reliability were .82 and .83 -- excellent for a two-item instrument. Concurrent validity was also high, with significant correlation with the SUS (.81, .81) and with likelihood-to-recommend (LTR) scores (.74, .73). The scores were sensitive to respondents' frequency-of-use. UMUX-LITE score means were slightly lower than those for the SUS, but easily adjusted using linear regression to match the SUS scores. Due to its parsimony (two items), reliability, validity, structural basis (usefulness and usability) and, after applying the corrective regression formula, its correspondence to SUS scores, the UMUX-LITE appears to be a promising alternative to the SUS when it is not desirable to use a 10-item instrument.

Citations (3)


... The social workers responded to the usability questions (UMUX-Lite) using a 7-point Likert scale, agreeing that the chatbot's capabilities met expectations toward addressing social needs (average score 5.4, SD 1.1) and that it is easy to use (average score 5.6, SD 1.8). Collectively, they agreed on the usability of chatbot, providing an average score of 72 on the System Usability Scale (calculated using the regression equation developed by Lewis et al [38]). ...

Reference:

Chatbot for Social Need Screening and Resource Sharing With Vulnerable Families: Iterative Design and Evaluation Study
Investigating the Correspondence Between UMUX-LITE and SUS Scores

Lecture Notes in Computer Science

... 41 A reliability analysis of the merged data set resulted in a Cronbach's alpha value of 0.83 for UMUX. 42 Lewis et al. 43 indicated that UMUX provides an alternative metric for perceived usability for situations where reducing the number of items is critical while obtaining accurate usability assessment. The items vary in tone; odd-numbered items have a positive tone, and even-numbered items have a negative tone. ...

Measuring Perceived Usability: The SUS, UMUX-LITE, and AltUsability

... Participants' reactions to the courses and the estimated patient acceptance of structured interviews were evaluated at t3 by means of an online questionnaire, which consisted of 32 selected items ( Table 2) from several instruments [6,[46][47][48][49][50]. There were 8 additional items only administered in the blended learning condition. ...

UMUX-LITE: when there's no time for the SUS