1. The document presents research on defining and identifying drivers of supply chain complexity. It describes interviews conducted with six large, international companies struggling with complexity. 2. The interviews and literature review identified seven common drivers of supply chain complexity: product portfolio, product modularization, uncertainty, organizational processes, IT/ERP systems, suppliers, and distribution networks. These drivers are interrelated and interconnected within companies. 3. A framework called the "Supply Chain Complexity Canvas" is introduced to map the identified drivers of complexity and their interconnectivity in order to help companies better understand and address complexity in a holistic way.