Abstract: The HSC is a key element for the success of HOs relief operations. Today, the HSC performance faces many challenges: (1) the increasing gap between funding and needs; (2) donors ask for more transparency and accountability; (3) the growing urgency of switching to sustainable development is gaining ground in public opinion. Consequently, to maintain a competitive position (order winner) in the near future, considering sustainability in addition to effectiveness and efficiency to measure the performance of the operations becomes fundamental. In the literature, some authors have highlighted that the lack of Decision Support Systems difficult the planning and achievement of sustainability performance objectives in humanitarian operations. Therefore, we propose a sustainability maturity assessment method to improve the sustainability of HSC operations. Using the information gathered from IFRC field research, as well as from the literature, a proof of concept is presented to demonstrate the relevance of the proposal.