Perspectives in Multilevel Decision-making in the Process Industry Braulio Brunaud 1 and Ignacio E. Grossmann *1 1 Carnegie Mellon University Pittsburgh, PA 15213 June 10, 2017 Abstract Decisions in supply chains are hierarchically organized. Strategic decisions involve long-term plan- ning of the structure of the supply chain network. Tactical decisions are mid-term plans to allocate production and distribution of materials. Operational decisions correspond to the daily planning of the execution of manufacturing operations. These planning processes are conducted independently with little exchange of information between them. Achieving a better coordination allows to capture benefits that are currently out of reach, and improving communications between different functional areas in a company. We propose a network representation for the multilevel decision structure, and analyze the components involved in finding integrated solutions. An integrated solution is one that maximizes the sum of the benefits of all nodes of the decision network. The task is very challeng- ing. However, significant progress has been made in each of its components. An overview of strategic models, mid-term planning models, and scheduling models, is presented to address the solution of each node in the decision network. Coordination mechanisms to converge to the integrated solutions are also analyzed, including solving large-scale models, multiobjective optimization, bilevel programming, and decomposition. We conclude by summarizing the challenges identified to achieve the full integration of multilevel decision-making in supply chain management. 1 Introduction Supply chains of the 21st Century are highly globalized. Nowadays, having a product that was manu- factured ten thousand kilometers away delivered in two weeks seems very natural. With the information revolution we have become used to receiving orders almost intantaneuously. This has put a tremendous * corresponding author: grossmann@cmu.edu 1