PSI is a testing and assessment partner that helps organizations create, deliver, and secure high-stakes exams. The company combines science, technology, and assessment expertise to support reliable, accurate, and fair testing, with a strong focus on the experience of test takers and the needs of its clients.

PSI offers expert test development, including rigorous exam design and psychometric services, as well as global delivery through testing centers, remote testing, online proctoring, and other multi-modal options. Its services also include test security audits and investigations, data forensics, web crawling, risk assessments, and incident response. AI-powered tools help organizations develop test content and create customized test preparation.

The company serves programs across certification, admissions, government, healthcare, IT, professional associations, military, occupational licensure, and higher education. Its programs include HiSET, a high school equivalency test, and Skills for English, an English proficiency test used for study, work, and UK visa applications. PSI also provides test taker support, program growth guidance, and resources for test owners.