PROLOG EXPERT SYSTEM FOR FORESTRY MANAGEMENT
             Contributed by Steve Jones, Reading University
                    Received on the 3rd of March 1988
                    Shelved on the 15th of March 1988


This entry comes  as two files. ESFM.PRE is this  file; ESFM.PL contains
the program.


To use the  program, consult ESFM.PL, and then call  the predicate 'go'.
It will ask you various questions  about your forest, and then recommend
action. Type  answers to  the questions as  Prolog atoms,  followed by a
full stop (i.e.  as input to 'read').  If you answer with  a wrong term,
the system will display a list of the allowed answers.


The main  predicate is 'go'.  This empties  the knowledge base  of stuff
from any  previous consultation,  and then calls  'recommendation(X)' to
establish the answers to questions and give advice.

'recommendation' calls 'fact'.  All but the last two  clauses for 'fact'
contain the rules.  The final two clauses obtain data  from the user, by
calling 'ask' if the answer to a question isn't already known.


ESFM  does not  explain  why it  asks  questions, or  how  it came  to a
conclusion.



CHECKED ON EDINBURGH-COMPATIBLE (POPLOG) PROLOG : yes.


PORTABILITY :

    Easy, no known problems.


INTERNAL DOCUMENTATION :

    Very little.