ACSI computes customer satisfaction scores by annually contacting approximately 70,000 North American customers
(about 250 customers per firm in the database). These customers are interviewed with a structured guide developed by Fornell et al. (1996), and their scores on this questionnaire are aggregated to create an individual customer satisfaction
index score for each firm that ranges between 0-100. The individual firm index scores are then combined to compute
industry and sector level indices (www.theacsi.org).