This quality standard covers the treatment and management of psychosis and schizophrenia (including related psychotic disorders such as schizoaffective disorder, schizophreniform disorder and delusional disorder) in adults with onset before the age of 60 years in primary, secondary and community care. It does not cover adults with transient psychotic symptoms. The standard sets out key quality statements, providing quality measures for each of them and explaining what they mean for service providers, health and social care practitioners, and commissioners and for patients, service users and carers. The eight statements cover: referral to early intervention in psychosis services; cognitive behavioural therapy; family intervention; treatment with clozapine; supported employment programmes; assessing physical health; promoting healthy eating, physical activity and smoking cessation; carer-focused education and support.