E-Verify was originally established in 1997 as the Basic Pilot Program to prevent illegal immigrants from obtaining employment illegally in the United States. In August 2007, DHS secretary Michael Chertoff and Commerce secretary Carlos Gutierrez announced several steps to expand employment eligibility verification. They started by requiring all federal contractors and vendors to use E-Verify. The Internet-based program is free and maintained by the United States government. Some states have passed legislation making it mandatory for certain businesses, other states require all employers use E-Verify. E-Verify compares information from an employee's Employment Eligibility Verification Form I-9 to data from U.S. government records. If the information matches, that employee is eligible to work in the United States. If there is a mismatch, E-Verify alerts the employer and the employee is allowed to work while he or she resolves the problem; they must contact the appropriate agency to resolve the mismatch within eight federal government work days from the referral date. The program is operated by the Department of Homeland Security (DHS) in partnership with Social Security Administration. According to the DHS website, more than 600,000 employers now use E-Verify. Over 1,400 companies enroll in the program every week. According to DHS, in 2011 a random sample of E-Verify users was surveyed on satisfaction with the program. DHS called the results "outstanding" noting that E-Verify received an overall customer satisfaction rating of 85, which is "based on the American Customer Satisfaction Index (ACSI), the national indicator of customer evaluations of the quality of goods and services available to U.S. residents." DHS notes that E-Verify’s score of 85 is a three-point increase from the 2010 survey and that E-Verify is "a trailblazer when compared to its federal government counterparts" because "E-Verify’s score is 20 points above the current federal government average.".