This report analyzes the conceptual framework for financial reporting and sustainability reporting. It discusses the adoption and application of the IASB conceptual framework, the benefits and limitations, and the use of the framework by Perpetual Limited. It also compares the sustainability reporting framework of GRI and the integrated reporting framework of IIRC. The report explores the strengths and limitations of conventional accounting in explaining sustainability and integrated reports, and discusses the connection between corporate social responsibility reporting and the stakeholder theory and legitimacy theory.