“…These experiments typically have demonstrated that changing the direc tions or language of an inventory has no important effect on the test taker (Boyd 1976, Gottfredson 1976, Siebel & Walsh 1977, Lawler 1979); also, inventories using different norms, scaling procedures, and interpretative materials have similar if not identical impact on the test taker (Zener & Schnuelle 1976, Prediger & Noeth 1979, much to the surprise of authors, practitioners, and publishers.…”