Özet:

In this study, E-Service Quality Scale, developed by Parasuraman (2004), has been given to evaluated by 415 clients who made shopping from company selling electronic device operates in five big cities of Turkey (İstanbul, Ankara, İzmir, Antalya, Eskişehir) and from virtual organizations at least three times. Obtained data has been defuzzyfied by fuzzy logic and has been emerging. After the data obtained was defuzzyfied by fuzzy logic theory, the defuzzyfied data has been applied to reliability and factor analysis. Then, comparisons has been performed among E-Service Quality of gittigidiyor.com E-Bay.com and hepsiburada.com settled the most commonly used as a shopping sites by measurement method based on space. The comparisons have been showed that ranking according to E-Service Quality and the most commonly used sites has been found same. In addition, the study,has been investigated which effective dimensions of E-Service Quality belonging to the most preferred three-sites and Privacy dimension has been determined to be very important. Being reliable of company operates on web base and believing of customers knowledge protected by company have been determined to increase use of sites

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