Often, after an inpatient stay, early readmission occurs, which is detrimental to the patient. University Psychiatric Clinics Basel developed a 3-month transitional intervention program to bridge inpatient and community treatment by supporting people after their discharge from the psychiatric hospital. In line with international guidelines, this transitional intervention was delivered as assertive community treatment in the homes of people who wished to participate. Data from the 3-year pilot project starting in 2019 have been collected to analyze the success of its implementation and treatment effectiveness in reducing follow-up inpatient treatment days when comparing people choosing to participate in the transitional program and receiving treatment (n