Satisfaction is a part of classic definition of usability since a long time. SUMI (Software Usability Measurement Inventory) has been developed to provide an authoritative, standardised measurement of user satisfaction with software. It can be used for the evaluation and comparison of products (or versions of a product) and to set and track verifiable targets regarding satisfaction. SUMI is a classical Likert-type measure of attitude toward a software package. The questionnaire comprises five subscales: efficiency, affect, helpfulness, control and learnability. SUMI analysis also provides a
The SUMI is a 50 items Likert-type questionnaire. Users of a product should indicate their agreement with 50 statements such as
validated instrument; database with results available for comparison of own test results
same drawbacks as with all subjective scales; focus mainly on software; scale mostly addresses classical usability issues, smaller part is about affect; the results are not highly informative for redesigners
Kirakowski, J. & Corbett, M. (1993). SUMI – The Software Usability Measurement Inventory. British Journal of Educational Technology, 24 (3), 210-212.
Kirakowski, J. (1994). The Use of Questionnaire Methods for Usability Assessment. Book chapter available on http://sumi.ucc.ie/.
http://sumi.ucc.ie/
