Validation of an Oral English Test Based on Many faceted Rasch Model

This Study investigates the validity of an English Oral English Test from three aspects: raters, examinees, and task difficulty based on the theory of Many faceted Rasch Model by using FACETS. The results show that there exist significant differences in the examinees’ oral ability and that raters’ rating has good internal self consistency, but there is significant difference in their severity and that tasks are significantly different in difficulty and that the differentiation is good enough to distinguish the examinees’ ability. In general, the good validity of the Oral English Test is provided, but the process of the examinees’ performance needs further study.