“…Often we seek to characterise this subspace in terms of the trajectories central tendency and spread using statistics. Another way of characterising it is in terms of the 'envelope' surrounding the set of trajectories -which can be approached using constraint programming techniques (Terán et al 2001). With the increasing complexity of subject matter and the increasing availability of computational power and data storage it will be advantageous to delay the simplification of data in terms of such descriptions as one might loose some of the qualatitative characteristics that later turn out to be important.…”