The Summer Simulation Multi-Conference 2017 (SummerSim’17) is a combination of the Summer Computer Simulation Conference (SCSC) and the International Symposium on Performance Evaluation of Computer and Telecommunications Systems (SPECTS). SummerSim is SCS’s premier international conference in cooperation with ACM SIGSIM. The conference focuses on modeling and simulation, tools, theory, methodologies and applications and provides a forum for the latest R&D results in academia and industry. This year’s focus is on the pervasive role of simulation tools, methodologies and technologies for enabling a more informed and effective online decision making. We encourage you to take this opportunity to experience the tutorials, tracks, and workshops that will be available.