Tech advances

I'm working on a framework for technology developments in Traveller (and
SF games in general).  First, I'm trying to come up with the general
categories available for advancement with tech level.  So far my list
contains the following:

      Physics
      Biology
      Engineering
      Psychology

Each major category can have, of course, subcategories.  My goal for these
categories is to be exhaustive, and approximately equal in effect.  Right
now, 4 categories seems a bit sparse.

So can anyone suggest some more non-overlapping categories?  For example,
Medicine is now a subcategory (unlisted) under Biology.  If you feel this
is a slight for a such a broad area, let me know and include your justifi-
cation.  Let me know if I've neglected something.

Also, if anyone wants to take issue with my categories as they now exist,
please do.  (I'll post my justifications so far if this thread generates
any interest.)

- -----

Chuck Hamilton                                           [email removed]

"Crew or frozen watch casualties are replaced free at any naval base."

                                     - Trillion Credit Squadron, p. 35