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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 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.