The purpose of this Guidance Note is to provide advice to various stakeholders about what is expected in good practice social impact assessment (SIA) and social impact management processes, especially in relation to project development. Project development refers to dams, mines, oil and gas drilling, factories, ports, airports, pipelines, electricity transmission corridors, roads, railway lines and other infrastructure including large-scale agriculture, forestry and aquaculture projects. This Guidance Note builds on IAIA’s (2003) International Principles for Social Impact Assessment. While the International Principles outline the overarching understandings of the SIA field, including the expected values of the profession, this document seeks to provide advice on good practice in the undertaking and appraisal of SIAs and the adaptive management of projects to address the social issues. As a statement of good and sometimes leading practice, not all the information in this document will necessarily be applicable in every situation – people utilising this information will need to establish for themselves what is appropriate in each particular context.