After Andreas Tolk published his "Avoiding another green elephant - a proposal for the next generation HLA based on the model driven architecture" paper in 2002 Fall Simulation Interoperability Workshop, we have to chance read various papers, book chapters even books about application of model-driven practices for the engineering of simulation systems. Almost 15 years after this paper, this year, we are making a dedicated symposium, MOD4SIM, within SpringSim that addresses model-driven approaches to simulation engineering. I would like to kindly invite you to the LinkedIn group that we launched for MOD4SIM. In this group, I just started a discussion with asking your favorite model-driven simulation papers. Please contribute our discussion with your comments.