The document outlines best practices and mandatory requirements for sustainability reporting and assurance, emphasizing the need for a harmonized global framework and a phased approach for implementation, particularly for smaller entities. It highlights the importance of corporate governance and oversight in improving the quality of sustainability reports and assurance, indicating that companies with such oversight are more likely to produce integrated reports. Additionally, the engagement of the accountancy profession, regulators, and stakeholders is essential for achieving high-quality sustainability assurance.