How are ACSI data collected?
Customers of all companies (and some federal agency customer segments) are selected from national and regional probability samples by screening a randomly chosen adult (age 18 to 84 for private sector companies) in each telephone household. The respondent is asked questions about the purchase and use of specific products and services purchased within specified, recent time periods (these periods vary according to the product or service). Those who qualify as respondents are then asked from which company or which brand they have purchased and responses to the ACSI survey questions are coded as a customer interview for that company. The ACSI for each company is based on a sample of 250 customer interviews with more than 65,000 interviews conducted annually.
