000K utf8 1100 $c2007 1500 ger 2050 urn:nbn:de:gbv:8-diss-21179 3000 Christophersen, Timo 4000 Usability im Online-Shopping$dEntwicklung eines Fragebogeninstrumentes (ufosV2) unter Berücksichtigung formativer und reflektiver Messmodelle$hChristian-Albrechts-Universität zu Kiel [Christophersen, Timo] 4030 Kiel$nChristian-Albrechts-Universität zu Kiel 4209 In usability research, difference between formative and reflective measurement models for the assessment of latent variables has been ignored largely. As a consequence, many usability scales are misspecified. This might result in reduced scale validity because of the elimination of important usability facets within the procedure of scale development. The aim of the current study was to develop a questionnaire for the evaluation of On-line store usability (UFOS-V2) that includes both a formative and a reflective scale. 378 subjects participated in a laboratory experimental study. Each participant visited two out of 35 On-line stores. The usability and intention to buy was assessed for both stores. In addition, actual purchase behaviour was observed by combining the subjects' reward with the decision to buy. In a two-construct PLS structural equation model the formative usability scale was used as a predictor for the reflective usability measure. Results indicate that the formative usability scale UFOS-V2f forms a valid set of items for the user-based assessment of online store usability. The reflective usability scale shows high internal consistency. In additional PLS-models, both UFOS scales showed positive effects on the intention to buy, suggesting high concurrent criterion validity. Relationships of UFOS scales with both trust and aesthetics were supported. Furthermore, a sequential multinomial regression analysis was performed on the decision to buy as outcome. Again, both UFOS-V2 measures provided good prediction of the criterion, confirming high predictive validity. In summary, the formative and the reflective UFOS measures fulfil all required scale criteria. Implications for human-computer interaction research are discussed. 4950 https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-21179$xR$3Volltext$534 4961 https://macau.uni-kiel.de/receive/diss_mods_00002117 5051 150 5550 E-Commerce 5550 Evaluation 5550 Formative and Reflective Measurement Models 5550 On-line Store 5550 P 5550 Questionnaire 5550 Success Factors 5550 Usability