Method and system for validating autonomous control software for a self-driving vehicle

Method and system for validating an automated control software, ACS, for a vehicle, wherein the ACS is adapted for operating a vehicle in autonomous driving mode. The method comprises simulating use of the ACS in agent movement scenarios, wherein said simulating includes providing input sensor data to each vehicle agent to which an ACS has been assigned, and wherein movement of each of the other agents in the simulation is controlled to move either according to a replay of a corresponding real-world agent, or by an agent movement model.