Realistic simulations of laser-driven radiation sources. What we need and what is there.

With upcoming supercomputer technology, the simulation of laser-driven radiation sources enters the realm of large-scale parameter surveys, interactive simulation and the possibility to add physical effects hitherto impossible to account for.
We present new ideas and techniques to deliver simulations that are closer to experiment and can be better connected to new experimental diagnostics.
We finally show how an integrated experimental and theoretical program is needed to increase the predictive capability of codes and why code validation will be the focus of laser plasma simulations.