Reliability Measurement
Within the consistency of measurement (Bachman & Palmer, 1996:19) there are two
main issues. First, would an examinee taking an identical test for a second time score equally
well if all other variables involved remained constant? This estimate, expressed as a
reliability coefficient falling between 0 and 1, is considered to be reliable if the number is
higher within these parameters. Lado (cited in Hughes, 1989: 32) suggests that “good
vocabulary, structure and reading tests are usually in the 0.9 to 0.99 range, while auditory
comprehension tests are more often in the 0.8 to 0.89 range”.