According to the 2016 ILO global estimates, there are a total of 152 million children in child labour and 25 million children and adults in forced labour in the world today. Governments, business, the financial sector and civil society must take strong action to address the root causes and determinants of these human rights violations. The Alliance 8.7 Report and this technical working paper are a contribution to these efforts. This technical paper explains in detail the methodology and datasets used to produce the results published in Chapter 1 of the Alliance 8.7 Report on Ending Child Labour, Forced Labour and Human Trafficking in Global Supply Chains on how child labour, forced labour and human trafficking are linked with global supply chains.