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The Marketing Scales website is a gold mine of information.  It is the only source that helps me understand the psychometric quality of the instruments used in past research.  I recommend that researchers bookmark this site . . . they will be back!
Bob Moritz
Marshfield Clinic Research Foundation

Complementarity of Product Forms

Three statements are used to measure the degree to which a consumer views the utility received from two different forms of a product to be greater than the utility of the best single form.