  We present two-dimensional hydrodynamical simulations of both jet- and
wind-driven models for protostellar outflows in order to make detailed
comparisons to the kinematics of observed molecular outflows.
  Comparing the different simulations with observations, we find that some
outflows, e.g., HH 212, show features consistent with the jet-driven model,
while others, e.g., VLA 05487, are consistent with the wind-driven model.
