An imminent rise in corporate scrutiny calls for global responsibility in implementing sustainability across organisational supply chains; a complex decision-making process requiring countless foundations, measures and procedures. We present a Decision Support System (DSS) to aid managers in implementing Sustainable Supply Chain Management (SSCM). This DSS is hinged on Key Performance Indicators (KPIs) identified from literature and practice, which are then ranked and prioritized by global experts, and brought together in this system to help managers with evaluating their supply chain sustainability, as well as guiding supply chain sustainability decision-making.