  A scattering model is developed for ultracold molecular collisions, which
allows inelastic processes, chemical reactions, and complex formation to be
treated in a unified way. All these scattering processes and various
combinations of them are possible in ultracold molecular gases, and as such
this model will allow the rigorous parametrization of experimental results. In
addition we show how, once extracted, these parameters can be related to the
physical properties of the system, shedding light on fundamental aspects of
molecular collision dynamics.
