The Quality of the Test
Reliability
Reliability is defined as the proportion of observed score variance that is due to true score variance. It is an indicator of the extent to which test scores will be consistent across different conditions of administration and/or administration of alternate forms of a test. The type of reliability used in the TOEIC Listening and Reading test is reported as an internal consistency measure using the KR-20 reliability index. The KR-20 reliability index assesses the extent to which all items measure the same construct. The more homogeneous the test items, the more consistently the test takers will perform. The reliability of the TOEIC Listening and Reading section scores across all forms from our norming samples has been approximately 0.90 and up.