The Adult Psychiatric Morbidity Surveys (APMS) (formerly known as the Surveys of Psychiatric Morbidity) are a series of surveys which provide data on the prevalence of both treated and untreated psychiatric disorders in the adult population (aged 16 and over). The first survey was conducted in 1993, covering 16 to 64-year-olds. A further survey was conducted in 2000 (covering 16 to 74-year-olds) and included respondents living in England, Scotland and Wales. From 2007 onwards, the surveys have been commissioned by NHS Digital on behalf of the Department of Health and Social Care (DHSC), including people aged over 16 (no upper age limit) living in England. For 2007 and 2014, the surveys were conducted by NatCen Social Research on behalf of NHS Digital. The surveys capture information on common mental disorders, mental health treatment and service use, post-traumatic stress disorder, psychotic disorder, autism, personality disorder, attention-deficit/hyperactivity disorder, bipolar disorder, alcohol, drugs, suicidal thoughts, suicide attempts, self-harm, and comorbidity.Further information can be found on the NHS Digital Adult Psychiatric Morbidity Surveys webpage.A similar series covering young people aged 5 to 15/16, the Mental Health of Children and Young People Surveys (MHCYP), is also commissioned by NHS Digital.  The purpose of the Homeless People Survey was to provide good baseline information about mental illness among homeless people in Great Britain. The survey aims were: 1. To estimate the prevalence of psychiatric morbidity among homeless people aged 16-64 years 2. To examine the varying use of services and receipt of care in relation to mental illness and housing circumstances 3. To look at comorbidity between mental illness and physical illness, and relationships with lifestyle indicators such as drugs, tobacco and alcohol 4. To investigate recent precipitating factors, including housing circumstances, which are associated with mental illness. Psychiatric morbidity among homeless people; alcohol, drug and tobacco use; alcohol dependence; physical complaints; use of services for homeless people; income and state benefits received; employment. Demographic variables included age, gender, marital status, homelessness and previous accommodation, including stays in psychiatric hospitals within the past five years and access to or registration with a GP. Day centre staff were asked about types of client the day centre caters for and kinds of services available, for instance whether GPs, mental health teams or housing advice workers were available. Standard Measures Clinical Interview Schedule - revised (CIS-R): a battery of questions covering the presence of, and severity of 14 symptoms of neurotic disorder. Responses lead, via algorithms, to diagnosis of neurotic disorders according to ICD-10 criteria. See reports for further details. This schedule was used for respondents in hostels and private sector local authority accommodation (PSLA). Psychosis Screening Questionnaire (PSQ): sift questionnaire covering 6 items indicative of psychosis. SCAN interview (see report for further details). 12-point General Health Questionnaire (GHQ12): asked of all informants by self-completion.