A multiple-item likert scale designed to measure the degree to which a person engages in activities to help another party as it provides him/her a service.
Auh, Seigyoung, Simon J. Bell, Colin S. McLeod, and Eric Shih (2007), “Co-production and Customer Loyalty in Financial Services,” Journal of Retailing, 83 (3), 359-370.
Free access to 2023+ psychometric scales at PsychScales