Reliability is the crucial concern of the test quality and is often definedas consistency of the measurement. The scores from one test should be consistent with
another set of scores regardless of the difference of the test-takers, test environment
and test format (Bachman and Palmer, 1996). Therefore, the test is reliable when the
identical or near identical test is administered twice and the result is consistent and
highly similar within the same group of the test-takers (Bachman and Palmer, 1996
cited in Cunningham, 2002). The TOEIC's reliability, estimated using the reliability
coefficient (Chauncey Group International, 1999), and is between 0.91 for listening
comprehension section (a value of 1 being perfect reliability). This statistical evidence
reflects the high reliability of the test.