Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.

Share this Page URL
Help

Psychometric Evaluation of the SUMI > Psychometric Evaluation of the SUMI - Pg. 191

Poststudy Questionnaires 191 (1,000), online (500), and online student (no charge). For descriptions of the services and their requirements, see http://sumi.ucc.ie/pricing.html. Psychometric Evaluation of the SUMI During its development, the SUMI underwent a considerable amount of psychometric development and evaluation (Kirakowski, 1996). The initial pool of SUMI items was 150. After content analysis by a group of 10 HCI experts and software engineers, the remaining pool contained 75 items. A factor analysis of responses to these 75 items by 139 end users plus detailed item analysis led to the final 50 items and a decision to use a three-step agreement scale for the items. Factor analysis of an independent sample of 143 users who completed the 50-item version of the SUMI revealed five subscales: · · · · · Efficiency: The degree to which the software helps users complete their work. Affect: The general emotional reaction to the software. Helpfulness: The degree to which the software is self-explanatory, plus the adequacy of help facilities and documentation. Control: The extent to which the user feels in control of the software. Learnability: The speed and facility with which users feel they mastered the system or learned to use new features.