PRONTO is a Sandia transient-dynamics finite-element code that is similar in scope to DYNA-3D or Pam-Crash. It models objects undergoing deformation; prototypical examples are a car crash or the denting/crushing of a shipping container. PRONTO includes a wide variety of material models and a smoothed- particle hydrodynamics (SPH) capability that enables high-strain simulations (e.g. an explosion) that would typically tangle or break conventional finite element meshes.