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.