1. Ambros-Ingerson , J. 1987 . IPEM Integrated Planning, Execution and Monitoring . Unpublished M. Phil. dissertation, Computer Science , University of Essex .
2. Anderson , J. 1990 . Toward a Theory of Temporal Reasoning for Practical Planning Systems . Technical Re¬port, Department of Computer Science , University of Manitoba , January .
3. Anderson , J. , and Evans , M. 1991b . What to Do Next Using Constraints in Reactive Planning . Working Paper, Department of Computer Science , University of Manitoba .