| Summary: | The aim of the study is to determine the reliability of performance scores of the medical education students in the skills by suturing and removal of suture and to investigate the scoring reliability of unbalanced data regarding students, raters, skills, tasks and their interactions by using generalizability theory. The study group consisted of 309 students who attended the Objective Structural Clinical Exam (OSCE) at Hacettepe University. 11 raters from the medical field took part in the assessment of the performance of students. Unbalanced (ö:p)x(g:b) design (ö: student, p: rater, g: task and b: skill) was used in this study. As a result, the variability of raters didn’t cause any differences in scoring. There is no difference in both skills and at each task of skills originating from rater effect. Reliability coefficients obtained by generalizability theory for the performance assessment process of the students’skills of suturing and removal of suture are at the acceptable level
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