The Security Industry Authority (SIA) is the organisation responsible for regulating the private security industry in the UK. It is a non-departmental public body reporting to the Home Secretary and was established in 2003 under the terms of the Private Security Industry Act 2001. The SIA has two main duties. One is the compulsory licensing of individuals undertaking designated activities within the private security industry; the other is to manage a voluntary Approved Contractor Scheme, which measures private security suppliers against independently assessed criteria.