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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

Reasons for Installing the Product (Independence)

The scale is composed of three, five-point Likert-type items measuring a consumer’s belief that installation of a particular energy-saving device would help reduce his/her dependence on other sources of energy.