part of part of part_of is about has value specification simulation software application simulation of time step simulation time step action specification An action specification that specifies the length of the time steps interval assumed in a simulation. An action specification that specifies the length of the time steps interval assumed in a simulation. Mathias Brochhausen simulation time step value simulation time step unit simulation run length The time step value and unit are specified using a scalar value specification. epidemic simulator action specification scalar value specification