The document discusses challenges and opportunities in using information and communication technologies (ICT) to help governance and policy modeling. It outlines four grand challenges: 1) model-based governance using integrated, multi-level simulations, 2) data-powered behavioral change using massive data and modeling of human behavior, 3) a government service utility allowing composition of public and private services, and 4) establishing a scientific base for ICT-assisted governance. It calls for collaborative efforts across sectors to address these challenges through open roadmapping and efforts like the CROSSROAD project.