In this study, personalization of online learning environments, learner participation, and satisfaction in using these environments are inquired. With this purpose in mind, learners' personalization preferences of appearance and their satisfaction regarding the personalization in online learning environments are determined. In data collection and analysis processes, both quantitative and qualitative methods were used. And the study was designed as an explanatory mixed method research. Data is collected from 60 second-year students registered to Instructional
Design Course in Computer and Instructional Technology in Education Department in Faculty of Education atEskisehir Osmangazi University, Eskisehir, Turkey. In the study, to test the difference between two means, independent samples t-test was carried out but among non-parametric methods, and Mann-Whitney U test was conducted, because the normality hypothesis was not obtained in the tests. In order to evaluate students' learning environment usage and personalization of appearance satisfaction, survey was provided. Moreover, focus group discussions and in-depth interviews were held with the students chosen among both the ones who fulfilled the personalization and the ones who did not. According to the results of the study, satisfaction level of the ones who did the personalization was higher than the ones who did not.