Gister-CL: An Evidential Reasoning System
- Sound and efficient approximate reasoning
- Interval probabilities
- Fuzzy possibilities
- Intuitive evidential operations
- Interactive, menu-driven, graphical interface
- Explanation through sensitivity analysis
- Formal and practical architecture
- Compilation into independent subroutines
SRI's work in automated uncertain reasoning emphasizes the practical application
of theoretically sound techniques for reasoning from evidence-that is,
information that is potentially incomplete, inexact, inaccurate, and from
diverse sources. SRI pioneered evidential reasoning for drawing conclusions from
multiple sources of evidential information about dynamic real-world
situations. We have developed formal foundations for
reasoning under uncertainty covering both probabilistic models (i.e.,
Bayesian and Dempster-Shafer) and possibilistic models (i.e., propositional
logic and fuzzy logic) and have incorporated all of these techniques into a
single uncertain reasoning tool, Gister.
Gister supports the rapid development of evidential reasoning systems
through an interactive, menu-driven, graphical interface, based upon Grasper-CL. The user interacts with the system in
much the same way as with electronic spreadsheets, by simply selecting from
menus to add evidential operations to an analysis, to modify data or
operation parameters, or to change any portion of the uncertain knowledge
base. In response, gister updates its analyses to reflect the new
Gister supports a wide range of evidential
operations, including fusion, source discounting, time projection,
summarization, evidence interpretation, and sensitivity analysis. Gister
has been applied to a wide range of problems, including multisensor
interpretation, mission planning, medical diagnosis, intelligence analysis,
underwater vehicle tracking, antiair threat identification, robot vehicle
navigation, and management decision support.
John D. Lowrance,
Artificial Intelligence Center
Gister, Gister-CL, and Grasper-CL are trademarks of SRI International.
Copyright © 1995-2000 SRI International, 333 Ravenswood Ave., Menlo Park, CA 94025 USA.
All rights reserved.