Professional testing firm PSI Services has acquired Computer Assisted Testing Services, a firm providing testing services for the aviation industry, the companies announced Tuesday. Terms of the deal between PSI, in Burbank, and Computer Assisted Testing Services, in San Mateo, were not disclosed. Chief Executive Steve Tapp said combining Computer Assisted with PSI will provide innovative products for thousands of candidates seeking aviation licensure and certifications. “We look forward to partnering with the experienced team at CATS and their clients, as we further our commitment to offering the most robust, full service, end-to-end testing solution in the industry,” Tapp said in a prepared statement. PSI provides services that include licensing and certification tests, managerial assessments and pre-hire employment selection to corporations, federal and state government agencies, professional associations and certifying bodies. Clients include national retailer Target Corp., Delta Air Lines, Department of Homeland Security, U.S. Postal Service, National Association of Legal Assistants and Center for Nursing, Education and Training. In January, PSI acquired Applied Measurement Professionals, a competitor providing assessment services to government agencies, professional associations and private industry.