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Scale Reviews

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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

Product Effectiveness (Stimulation Duration)

How long a product improved a person’s mental performance is assessed with four, seven-point items.  To answer the questions, the respondent must have used the product rather than merely hearing about it.  The scale seems to be amenable for use with a variety of foods and supplements for which claims are made about increasing one’s cognitive ability in some way.