The purpose of this study was to reflect on the opinions of secondary school students about their effects on school management's decision-making processes. In this descriptive study, comparative survey method has been used according to sub-purposes which require difference tests. Population of the research was 2883 students who are having education at eight secondary schools in Beypazari district. Purposive sampling method was used to determine the research group. This research group was 116 students who had been chosen as class representatives by their classmates. The questionnaires were taken to the schools mentioned above in 2008-2009 Academic Year's second term. Arithmetic mean, standard deviation, t test, Kruskal-Wallis H test and Mann-Whitney U tests are used to analyze data. According to the findings of the research, the general state levels are found noteworthy lower than the general demand levels on decision-making processes of school management's for students. In addition to this, students emphasize that they're more effective and willing on decision-making processes when school management takes instructional decisions rather than administrative decisions. It doesn't make any significant difference of the students' gender and the grade they are educated when the effectiveness and willingness are taken into the consideration. Students, who are having education at Anatolian High Schools, specify that they are unable to affect the school management's decision making processes. Also these students demand to affect decision-making processes much more than the other types of schools' students.