@InProceedings{	  valiente:lncs:689:1993,
  author	= {Gabriel Valiente},
  booktitle	= {Proc.\ 7th Int.\ Symposium on Methodologies for
		  Intelligent Systems},
  pages		= {86--95},
  publisher	= {Springer-Verlag},
  series	= {Lecture Notes in Computer Science},
  title		= {Input-Driven Control of Rule-Based Expert Systems},
  volume	= {689},
  year		= {1993},
  abstract	= {Most expert system control strategies focus on a narrow
		  view of problem solving, with the resulting expert systems
		  failing to accomplish a good interaction with the task
		  environment during problem solving. Known as the pregnant
		  man problem, such a deficient external behavior is typical
		  of many expert systems that ask absurd questions of the
		  user. Right interaction with the task environment has been
		  already addressed as a verification problem. A new
		  framework for realizing a good external behavior is
		  presented in this paper, that consists of incorporating
		  constraints on external behavior in the control strategy of
		  the expert system. Called input-driven control, it
		  cooperates with the standard control strategies of the
		  Milord II expert system shell for realizing both a correct
		  problem-solving behavior and an appropriate external
		  behavior.}
}