Today there are 16 million slaves in business supply chains. New regulations alongside rising expectations by consumers and investors require companies to conduct human rights due diligence to prevent and mitigate negative human rights impacts. To comply with the new reporting requirements, organizations are required to provide information on the steps they are taking to prevent and mitigate modern slavery from happening in their own operations and supply chain. A comprehensive modern slavery risk assessment, constitutes the first part of the due diligence process and is essential to identify slavery risks within an entities own activities and supply chain. To collect the necessary data a variety of data sources and methods are useful such as supplier due diligence questionnaires.