In this paper, we describe an approach to providing adaptivity in e-education courses. The primary goal of the paper is to enhance an existing e-education system, namely Moodle LMS, by developing a method for creating adaptive courses, and to compare its effectiveness with non-adaptive education approach. First, we defined the basic requirements of a course adaptation and the steps required to implement it. Based on the collected data, we identified the characteristic groups of students and then classified all participating students into these groups. The final adaptation of courses was performed in the distance education system of the University of Belgrade, in the Laboratory for e-business, Faculty of Organizational Sciences. Findings of the experimental study showed that the students' effectiveness and achievements in learning were higher when they attended courses adapted using the described method, in comparison to the non-adaptive e-learning courses. (Contains 4 tables and 6 figures.)