Claim: IPS supports employment for people with mental illness, but the concept has not yet been structured into rules and principles for employment.
Evidence: IPS Supported Employment is an evidence-based approach to supported employment for people who have a mental illness. IPS has been extensively researched and proven to be effective compared to standard employment services. IPS is based on eight principles. Mental health agencies that implement IPS aim to follow these principles in delivering vocational services. 
This research has established IPS as an evidence-based practice in community psychiatry. In addition to testing the comparative effectiveness of IPS, researchers have conducted implementation research on IPS, research on predictors of outcome (who gets jobs and why), barriers to employment for people who have a serious mental illness, and a number of other These results, along with data from non-research implementations of IPS, have resulted in the establishment of benchmark employment rates for IPS programs.