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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

Co-Production Effort

Five unipolar items with a Likert-type response format measure the extent of effort and time invested by a consumer in a specific product assembling process.