1) The possibility of assigning new track ID (creating new particle) for
   hadrons undergoing inelastic scattering, in all physics lists,
   and steerable from the physics lists. The choice
   should be under user control since it depends on specific studies. 
   This is necessary to understand the behaviour of the tracking for example
   where if the leading outgoing particle has very different kinematic from 
   the incoming particle it is misleading to see it as a single particle. 

   In cases where different behaviors of a model are a priori possible 
   (for instance the desired changing or not changing the track ID for pions
    undergoing inelastic scattering), the default behaviour should be clearly 
   stated and easily switchable by the user.
 
2) All available physics processes, models, cross-sections, etc., 
   should provide documentation of the technical aspects of the implementation:
   details of the expected behaviour of a model should be provided (for example
   how incoming and outgoing particles are handled).
   This applies to both hadronic and electromagnetic processes.

3) A physics list should be implemented in a coordinated way regarding the
   output of the models' behaviour, so that such behaviour would be consistent as
   much as possible. 
   For example an incoming particle should always be (or not be) killed in all
   inelastic scattering models of a given physics list.
   In the cases where this is not possible (due to specific characteristcs 
   of the models) the difference should be clearly described. 

4) When the behaviour of a specific physics list depends on parameters (for 
   example on a momentum threshold) this should be clearly documented, 
   specifying if such parameters are fixed or under user control.