Local Authorities are also now required to produce Local Development Schemes (LDS) – which outline the work the LDDs/SPDs they intend to produce over a three-year period, and Statements of Community Involvement (SCI), which outline how the Council will involve the local community. All LDDs and SPDs also have to be accompanied by a Sustainability Appraisal (SA) and a Strategic Environmental Assessment (SEA). The SEA is a requirement under European Union laws. Planning Policy Guidance Notes are also being gradually replaced by Planning Policy Statements.