"Sensible" use of generics

[Christoph Seelhorst <Christoph.Seelhorst@erno.de>]

We have recently had some internal discussions about the extent to which 
generics should be used.
The extremes are between "if it's not generic, its not Ada" and the
total
avoidance of generics.
Using generics in constructs as trees seems to be undisputable.  Another
way of using generics is to use them as a rather short template with a  
big number of instantiation parameters. This is the question to the
experts :  
   are there general rules of thumb what ratio between the size
   of a generic procedure and the instantiation parameters is still
   sensible ?

Regards,  Christoph