Comment. Most people with mental illness worldwide receive no treatment at all.1 The number benefiting from effective treatment is even fewer—eg, as low as one in six people with major depression receive effective care in high-income countries, and one in 27 people in low-income or middle-income countries.2 For mild-to-moderate depression, the treatments of choice are psychological therapies.3 ;  4 Are there any examples of a health-care system successfully scaling up evidence-based practice for such common mental disorders? Yes: evidence is emerging that the Improving Access to Psychological Therapies (IAPT) programme in England fits this bill as reported by David M Clark and colleagues in The Lancet. 5 . Please contact the library to request a copy of this article - http://bit.ly/1Xyazai