Reliability is the test’s reliability attention for its “consistency of measurement” and include two main arguments. Firstly, examine re-taking the test thereafter like or comparable scores? The higher this assessment as a reliability coefficient of between 0-1, the more reliable the test. Secondly, given that person scores will change slightly, The smaller this assessment as a standard Error of measure assess, the test scores compare true (Bachman and Palmer, 1996:19).Consequently, the test is reliable when the related or near test managed twice and the effect are the same group of the test-takers (Bachman and Palmer, 1669 cited in Cunningham,2002).
The TOEIC’s reliability, approximate using the reliability coefficient between 0.91 for listening comprehension section (Chauncey Group International Ltd., 1998a: section 4.2). However, these data pertain only to measure of the perceptive abilities.