Region Jönköping County (RJC) in Sweden is a healthcare system that is characterised by sustainable work with quality in healthcare and long-term system-wide improvement. This article describes important factors behind the improvement work in RJC, and how the improvement methods and initiatives have been adopted also in mental healthcare. For example, patients otherwise eligible for admission to a psychiatric department were treated at home after introduction of home treatment teams. Patient satisfaction was high and the number of visits to the emergency department, hospital admissions and hospital stay decreased.