In Tenth International Conference on Applications of Artificial
Intelligence in Engineering, Udine, Italy, July 1995.
Presented also at the Eighth International Workshop on Qualitative
Reasoning on Physical Systems, 1994, Nara, Japan.

		A SEMI-QUANTITATIVE PHYSICS COMPILER

		   Adam Farquhar	Giorgio Brajnik

Incomplete information is present in many engineering domains,
hindering traditional and non-traditional simulation techniques.  This
paper describes SQPC (semi-quantitative physics compiler), an
implemented approach to modelling and simulation that can predict the
behavior of incompletely specified systems, such as those that arise
in the water control domain. SQPC is the first system that unifies
compositional modeling techniques with semi-quantitative
representations.  We describe SQPC's foundations, QSIM and QPC, and
how it extends them. We demonstrate SQPC using an example from the
water supply domain.