The Outcome Questionnaire 45 (OQ-45), created by Gary M Burlingame and Michael J. Lambert at Brigham Young University, is a 45-item multiple-choice self-report inventory used to measure psychotherapy progress in adults patients.
The OQ-45 is currently in its second version (OQ-45.2), which was released in October 2013 by OQ Measures, the company founded by Burlingame and Lambert.
The questionnaire was originally developed as a paper version, and was later made available in mobile and web-based formats.
The OQ-45 measures progress across three different domains of experience: Points are assigned for each response using the following scoring rubric: Never (0), Rarely (1), Sometimes (2), Frequently (3), and Almost Always (4).
The instrument's administration and scoring manual provides thresholds for clinically significant distress and impairment, and for reliable change.