The National Planning Policy Framework sets out an expectation that the standard method will be used by local authorities to assess local housing needs, while recognising there may be exceptional circumstances that justify the use of an alternative approach. The Framework does not set out an exhaustive list of what may or may not constitute an exceptional circumstance, but it does explain that this can include issues relating to the particular demographic characteristics of an area. It is for the local authority to determine if there are exceptional circumstances, and to then justify the use of an alternative method when bringing its plan forward for examination.