Sorry about that! I mean that I basically agree with Michell (etc.). However students and practitioners don't have the luxury of saying "Michell is correct and I will no longer use tests as a methodod of assessing behaviour". For someone (a lecturer, licensing body or whoever) will have decreed that students, practitioners and whoever else reads the book will need to use and develop tests, evaluate their reliability, validity and perform all the other analyses which we enjoy so much. So the book covers the usual psychometric theory and techniques, whilst reminding readers that if what Michell said is indeed true, it is not clear whether these techniques are appropriate or whether the results are meaningful.
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