Reliability and Validity
The comparison between the G-TELP test and the Practice Testearlier in this paper emphasized that the Practice Test, applied toone individual, offered no statistical base for calculating any kind of technical reliability or validity. To the extent that the Practice Testmirrors the G-TELP test it is likely to be defensible. However thePractice Test is not assessing any overall competence orachievement in L2. It is attempting to pinpoint and diagnoseproblem areas for attention by students and their tutors. In thoseterms, we would need the largest possible sample of participatingstudents, testing over a period of time under closely observedconditions, to draw any credible conclusions about the real value(reliability and validity) of the Practice Test