Books and Theses

• John W. Sheppard and William R. Simpson (eds.), Research Perspectives and Case Studies in System Test and Diagnosis, Kluwer Academic Publishers, Norwell, Massachusetts, 1998.
• John W. Sheppard, Multi-Agent Reinforcement Learning in Markov Games, Ph.D. Dissertation, The Johns Hopkins University, Baltimore, Maryland, 1996.
• William R. Simpson and John W. Sheppard, System Test and Diagnosis. Kluwer Academic Publishers, Norwell, Massachusetts, 1994.
• John W. Sheppard, Learning Diagnostic Information Using a Matrix-Based Approach to Knowledge Representation, Master's Project Report, The Johns Hopkins University, Baltimore, Maryland, 1989.

Journal Articles and Book Chapters

• Brian Haberman and John W. Sheppard, "Overlapping Particle Swarms for Energy-Efficient Routing in Sensor Networks," submitted to Swarm Intelligence, Springer, May 2008.
• Kihoon Choi, Satnam Singh, Anuradha Kodali, Krishna Pattipati, John Sheppard, Setu Madhavi Namburu, Shunsuke Shigua, Danil Prokhorov, and Liu Qiao, "Novel Classifier Fusion Approaches for Fault Diagnosis in Automotive Systems," to appear in IEEE Transactions on Instrumentation and Measurement, February 2008.
• Stephyn G. W. Butcher and John W. Sheppard, "Distributional Smoothing in Bayesian Fault Diagnosis," to appear in IEEE Transactions on Instrumentation and Measurement, April 2008.
• John W. Sheppard and Stephyn G. W. Butcher, “A Formal Analysis of Fault Diagnosis with D-Matrices,” Journal of Electronic Testing: Theory and Applications, 2007.
• John W. Sheppard and Mark A. Kaufman, “A Bayesian Approach to Diagnostics and Prognostics from Built In Test,” IEEE Transactions on Instrumentation and Measurement, special issue on Built In Test, Vol. 54, No. 3, June 2005.
• John W. Sheppard and William R. Simpson, “Accurate Diagnosis through Conflict Management," in Research Perspectives and Case Studies in System Test and Diagnosis, Kluwer Academic Publishers, Norwell, Massachusetts, 1998.
• Lee A. Shombert and John W. Sheppard, “A Behavior Model for Next Generation Test Systems,” Journal of Electronic Testing: Theory and Applications, Vol. 13, No. 3, December 1998, pp. 299–314.
• John W. Sheppard, “Co-Learning in Differential Games,” Machine Learning, Special Issue on Multi-Agent Learning, Vol. 33, No. 2/3, November/December 1998, pp. 201–233.
• John W. Sheppard, “Inducing Diagnostic Inference Models from Case Data,” in Research Perspectives and Case Studies in System Test and Diagnosis, Kluwer Academic Publishers, Norwell, Massachusetts, 1998.
• John W. Sheppard and William R. Simpson, “Managing Conflict in System Diagnosis,” IEEE Computer, Vol. 31, No. 3, March 1998.
• John W. Sheppard and Steven L. Salzberg, “A Teaching Strategy for Memory-Based Control,” Artificial Intelligence Review, Special Issue on Lazy Learning, Vol. 11, pp. 343–370, 1997. Also appears as chapter of book titled Lazy Learning.
• John W. Sheppard and Gerald C. Hadfield, “The Object-Oriented Design of Intelligent Test Systems,” CrossTalk: The Journal of Defense Software Engineering, August 1994 (reprinted from AUTOTESTCON 93).
• William R. Simpson and John W. Sheppard, “Fault Isolation in an Integrated Diagnostics Environment,” IEEE Design and Test of Computers, Vol. 10, No. 1, 1993.
• John W. Sheppard and Gerald C. Hadfield, "The Object-Oriented Design of Intelligent Test Systems," IEEE AUTOTESTCON 93, San Antonio, TX, September 1993, pp. 235-242.
• John W. Sheppard and William R. Simpson, “Performing Effective Fault Isolation in Integrated Diagnostics,” IEEE Design and Test of Computers, Vol. 10, No. 2, 1993.
• John W. Sheppard and William R. Simpson, “Applying Testability Analysis for Integrated Diagnostics,” IEEE Design and Test of Computers, Vol. 9, No. 3, September 1992.
• Arnold G. Blair, John W. Sheppard, and William R. Simpson, “CALS and Computer Diagnostic Aids: A Partnership for System Support,” CALS Journal, Vol. 1, No. 1, Spring 1992.
• Larry V. Kirkland, John W. Sheppard, and William R. Simpson, “Evaluating AI-ESTATE Standards Compliance Using a Functional Intelligence Ratio,” CrossTalk: The Journal of Defense Software Engineering, No. 39, December 1992.
• John W. Sheppard and William R. Simpson, “Expert Systems for Diagnostic Testing,” Avionics Magazine, Vol. 16, No. 10, October 1992, pp. 47-52.
• Arnold Blair, William R. Simpson, and John W. Sheppard, “A Partnership for Systems Support: Artificially Intelligent Maintenance Aids and CALS,” Logistics Spectrum, Vol. 26, Issue 3, Summer 1992, pp. 19-26.
• William R. Simpson and John W. Sheppard, “System Testability Assessment for Integrated Diagnostics,” IEEE Design and Test of Computers, Vol. 9, No. 1, 1992.
• John W. Sheppard and William R. Simpson, “Information Fusion and the Diagnosis of Avionics Systems,” Invited article for The ITEA Journal of Test and Evaluation, Vol. XII, No. 3, 1991.
• William R. Simpson and John W. Sheppard, “Information Fusion and the Testability of Avionics Systems,” Invited article for The ITEA Journal of Test and Evaluation, Vol. XII, No. 2, 1991.
• John W. Sheppard and William R. Simpson, “A Mathematical Model for Integrated Diagnostics,” IEEE Design and Test of Computers, Vol. 8, No. 4, 1991.
• William R. Simpson and John W. Sheppard, “System Complexity and Integrated Diagnostics,” IEEE Design and Test of Computers, Vol. 8, No. 3, 1991.

Refereed Conference and Workshop Papers

• John W. Sheppard, Timothy J. Wilmering, and Mark A. Kaufman, “IEEE Standards for Prognostics and Health Management,” to appear in IEEE AUTOTESTCON 2008 Conference Record, Salt Lake City, UT, September 2008.
• Edward Kao, Peter VanMaasdam, and John Sheppard, "Image-Based Tracking Utilizing Particle Swarms and Probabilistic Data Association," to appear in Proceedings of the IEEE Swarm Intelligence Symposium, St. Louis, MO, September 21-23, 2008.
• Stephyn G. W. Butcher and John W. Sheppard, "Asset-Specific Bayesian Diagnostics in Mixed Contexts," IEEE AUTOTESTCON 2007 Conference Record, Baltimore, MD, September 2007.
• Stephyn G. W. Butcher and John W. Sheppard, “Improving Diagnostic Accuracy by Blending Probabilities: Some Initial Experiments,” Proceedings of the 18th International Workshop on Principles of Diagnosis (DX-07), Nashville, TN, May 2007.
• Kihoon Choi, Satnam Singh, Krishna Pattipati, John W. Sheppard, Setu Madhavi Namburu, Shunsuke Chigusa, Danil V. Prokhorov, and Lui Qiao, "Novel Classifier Fusion Approaches for Fault Diagnosis in Automotive Systems," IEEE AUTOTESTCON 2007 Conference Record, Baltimore, MD, September 2007.
• Mark A. Kaufman, John W. Sheppard, and Timothy J. Wilmering, "Model-Based Standards for Diagnostic and Maintenance Information Integration," IEEE AUTOTESTCON 2007 Conference Record, Baltimore, MD, September 2007.
• Sean R. Martin, Steve E. Wright, and John W. Sheppard, "Offline and Online Evolutionary Bi-Directional RRT Algorithms for Efficient Re-Planning in Environments with Moving Obstacles," Proceedings of the 3rd annual IEEE Conference on Automation Science and Engineering, New York: IEEE Press, September 2007.
• Satnam Singh, Kihoon Choi, Anuradha Kodali, Krishna Pattipati, John Sheppard, Setu Madhavi Namburu, Shunsuke Chigusa, Danil V. Prokhorov, and Liu Qiao, “Dynamic Multiple Fault Diagnosis: Mathematical Formulations and Solution Techniques,” Proceedings of the 18th International Workshop on Principles of Diagnosis (DX-07), Nashville, TN, May 2007.
• Timothy J. Wilmering and John W. Sheppard, “Ontologies for Data Mining and Knowledge Discovery to Support Diagnostic Maturation,” Proceedings of the 18th International Workshop on Principles of Diagnosis (DX-07), Nashville, TN, May 2007.
• Stephen G. W. Butcher, John W. Sheppard, Mark A. Kaufman, Hanh Ha, and Craig MacDougall, “Experiments in Bayesian Diagnostics with IUID-Enabled Data,” IEEE AUTOTESTCON 2006 Conference Record, Anaheim, California, September 2006, pp. 605–614.
• John W. Sheppard, Stephyn G. W. Butcher, Mark A. Kaufman, and Craig MacDougall, “Not-So-Naïve Bayesian Networks and Unique Identification in Developing Advanced Diagnostics,” Proceedings of the IEEE Aerospace Conference, Big Sky, Montana, March 2006.
• John W. Sheppard and Stephyn G. W. Butcher, “On the Linear Separability of Diagnostic Models,” IEEE AUTOTESTCON 2006 Conference Record, Anaheim, California, September 2006, pp. 626–635.
• John W. Sheppard and Timothy J. Wilmering, “Recent Advances in IEEE Standards for Diagnosis and Diagnostic Maturation,” Proceedings of the IEEE Aerospace Conference, Big Sky, Montana, March 2006.
• Brian Howard and John W. Sheppard, “The Royal Road Not Taken: A Re-Examination of the Reasons for GA Failure on R1,” Proceedings of the Genetic and Evolutionary Computation Conference, Seattle, Washington, June 2004.
• Rashad Moore, John W. Sheppard, and Ashley Williams, “Multi-Agent Simulation of Airline Travel Markets,” Proceedings of the Genetic and Evolutionary Computation Conference, Seattle, Washington, June 2004.
• John W. Sheppard, “System Prognostics with Non-Linear Time Series Prediction: Preliminary Results,” IEEE International Workshop on System Test and Diagnosis Digest, October 2000, Atlantic City, New Jersey.
• Mike Waters and John W. Sheppard, “Genetic Programming and Co-evolution with Exogenous Fitness in an Artificial Life Environment,” Proceedings of the Congress on Evolutionary Computation, May 1999.
• John W. Sheppard, “Information Superiority through Intelligent Information Operations,” Proceedings of the Joint Aerospace Weapon System, Support, and Simulation Symposium, San Diego, California, May 1999.
• John W. Sheppard and William R. Simpson, “Standardized Representations of Diagnostic Models,” Proceedings of the IEEE International Conference on System, Man, and Cybernetics, La Jolla, California, October 1998.
• John W. Sheppard and Leslie A. Orlidge, “Artificial Intelligence Exchange and Service Tie to All Test Environments (AI-ESTATE)—A New Standard for System Diagnostics,” Proceedings of the International Test Conference, Washington, DC, October 1997.
• John W. Sheppard and William R. Simpson, “Improving the Accuracy of Diagnostics Provided by Fault Dictionaries,” Proceedings of the 14th VLSI Test Symposium, Princeton, New Jersey, April 1996.
• John W. Sheppard and Steven L. Salzberg, “Combining Genetic Algorithms with Memory-Based Reasoning,” Proceedings of the 6th International Conference on Genetic Algorithms, Pittsburgh, Pennsylvania, July 1995.
• John W. Sheppard and Steven L. Salzberg, “Bootstrapping Memory-Based Learning with Genetic Algorithms,” 1994 AAAI Case-Based Reasoning Workshop, Seattle, WA, August 1994.
• William R. Simpson and John W. Sheppard, “The Impact of Commercial Off-the-Shelf (COTS) Equipment on System Test and Diagnosis,” Proceedings of the International Test Conference, Baltimore, MD, September 1993.
• John W. Sheppard, “Inducing Classification Rules for Public Health Data,” Proceedings of the Second International Workshop on Multistrategy Learning, Harpers Ferry, West Virginia, May 1993.
• John W. Sheppard and William R. Simpson, “Elements of Machine Learning is a Field Diagnostic Maintenance Aid,” Proceedings of  the ADPA Symposium on Artificial Intelligence Applications for Acquisition Management, Logistics Management, and Personnel Management, Williamsburg, Virginia, March 1992.
• William R. Simpson and John W. Sheppard, “An Intelligent Approach to Automatic Test Equipment,” Proceedings of the International Test Conference, Nashville, Tennessee, October 1991.
• John W. Sheppard and William R. Simpson, “Using a Competitive Learning Neural Network to Evaluate Software Complexity,” Proceedings of the 1990 ACM Symposium on Personal and Small Computers, Crystal City, Virginia, March 1990.
• William R. Simpson, Brian A. Kelly, and John W. Sheppard, “Clinical Protocol Development: An Information Theoretic Approach,” Sixth World Congress on Medical Informatics, Part a - Beijing, China, October, 1989, Part b - Raffle City, Singapore, December, 1989.
• John W. Sheppard and William R. Simpson, “Functional Path Analysis: An Approach to Software Verification,” Proceedings of the 1988 ACM Computer Science Conference, Atlanta, Georgia, February 1988.

Invited Papers and Talks

• John W. Sheppard, “Design for Test—The Integrated Diagnostics Perspective,” Invited Panelist, AUTOTESTCON 2006, Anaheim, California, September 2006.
• John W. Sheppard, “Information-Based Standards and Diagnostic Component Technology,” Invited Paper and Plenary Talk for 2nd IEEE International Workshop on System Test and Diagnosis, Atlantic City, New Jersey, September 1999.
• John W. Sheppard, “Artificial Intelligence in Diagnosis,” Invited Seminar, Institute for Information Industry, Taipei, Taiwan, February 1998.
• John W. Sheppard, “The Role of Information Modeling in Developing Standards,” Invited Seminar for Computer Science Department, Florida State University, March 1998.
• John W. Sheppard, “System Test and Diagnosis,” Invited Seminar, Institute for Information Industry, Taipei, Taiwan, February 1998.
• John W. Sheppard, “Is ROI Sufficient Justification for DFT?” Keynote Address, 1993 Economics of Test Workshop, Austin, Texas, May 1993.
• John W. Sheppard, “Testing Fully Testable Systems: A Case Study,” Invited Panel Presentation for the International Test Conference, Baltimore, Maryland, September 1993.
• William R. Simpson and John W. Sheppard, “Design for Testability and Diagnosis at the System Level,” Invited Paper for Proceedings of the NASA Space Operations, Applications, and Research (SOAR) Conference, Houston, Texas, August 1992.
• William R. Simpson and John W. Sheppard, “A Model Based Approach to System Test and Diagnosis,” Invited Presentation for the International Conference on Computer Design, Cambridge, Massachusetts, October 1992.
• John W. Sheppard, “System Perspective on Diagnostic Testing,” Invited Panel Presentation for the International Test Conference, Baltimore, Maryland, September 1992.
• Eugene A. Esker, Jean-Paul Martin, William R. Simpson, and John W. Sheppard, “Integrating Design for Testability and Automated Testing Approaches,” IEEE AUTOTESTCON ’90 Conference Record, San Antonio, Texas, September 1990.
• John W. Sheppard, “An Approach to Verifying Expert System Rule Bases,” Invited Paper for 1989 International Conference on Systems, Man, and Cybernetics, Boston, Massachusetts, November 1989.

Unrefereed Conference and Workshop Papers

• John W. Sheppard and Mark A. Kaufman, “Bayesian Diagnosis and Prognosis Using Instrument Uncertainty,” IEEE AUTOTESTCON 2005 Conference Record, Orlando, Florida, September 2005.
• John W. Sheppard and Mark A. Kaufman, “Bayesian Modeling: An Amendment to the AI-ESTATE Standard,” IEEE AUTOTESTCON 2005 Conference Record, Orlando, Florida, September 2005.
• John W. Sheppard, “Accounting for False Indication in a Bayesian Diagnostics Framework,” IEEE AUTOTESTCON 2003 Conference Record, Anaheim, California, September 2003.
• John W. Sheppard and Mark A. Kaufman, “An Integrated View of Test and Diagnostic Information Standards,” IEEE AUTOTESTCON ’02 Conference Record, Huntsville, Alabama, October 2002.
• Antony Bartolini, John W. Sheppard, and Thomas E. Munns, “An Application of Diagnostic Inference Modeling in Vehicle Health Management,” IEEE AUTOTESTCON 01 Conference Record, Valley Forge, Pennsylvania, August 2001.
• John W. Sheppard and Mark A. Kaufman, “Formal Specification of Testability Metrics in P1522,” IEEE AUTOTESTCON 01 Conference Record, Valley Forge, Pennsylvania, August 2001.
• John W. Sheppard and Mark A. Kaufman, “IEEE 1232 and 1522 Standards,” IEEE AUTOTESTCON 2000 Conference Record, Anaheim, California, September 2000.
• John W. Sheppard and Mark A. Kaufman, “IEEE Test and Diagnosis Standards,” Proceedings of the 19th Digital Avionics Systems Conference, August 2000.
• John W. Sheppard and Amanda Jane Giarla, “Information-Based Standards and Component Technology,” IEEE AUTOTESTCON 2000 Conference Record, Anaheim, California, September 2000.
• John W. Sheppard and Mark A. Kaufman, “AI-ESTATE—The Next Generation,” IEEE AUTOTESTCON 99 Conference Record, San Antonio, Texas, September 1999.
• Mark A. Kaufman and John W. Sheppard, “P1522: A Formal Standard for Testability and Diagnosability Standards,” IEEE AUTOTESTCON 99 Conference Record, San Antonio, Texas, September 1999.
• John W. Sheppard and William R. Simpson, “Prototyping a Diagnostic Interface,” IEEE AUTOTESTCON ’98, Salt Lake City, Utah, August 1998.
• John W. Sheppard, Antony Bartolini, and Leslie A. Orlidge, “Standardizing Diagnostic Information Using IEEE AI-ESTATE,” IEEE AUTOTESTCON 97 Conference Record, Anaheim, California, September 1997.
• Richard L. Maguire and John W. Sheppard, “Application Scenarios for AI-ESTATE Services,” IEEE AUTOTESTCON ‘96 Conference Record, Dayton, Ohio, September 1996.
• William R. Simpson and John W. Sheppard, “Diagnosis: Art versus Science,” Proceedings of NEPCON West, Anaheim, California, February 1996.
• William R. Simpson and John W. Sheppard, “Encapsulation and Diagnosis with Fault Dictionaries,” IEEE AUTOTESTCON ‘96 Conference Record, Dayton, Ohio, September 1996.
• Don Gartner and John W. Sheppard, “An Experiment in Encapsulation in System Diagnosis,” IEEE AUTOTESTCON ‘96 Conference Record, Dayton, Ohio, September 1996.
• John W. Sheppard, “Maintaining Diagnostic Truth with Information Flow Models,” IEEE AUTOTESTCON ‘96 Conference Record, Dayton, Ohio, September 1996.
• John W. Sheppard and William R. Simpson, “A Systems View of Test Standardization,” IEEE AUTOTESTCON ‘96 Conference Record, Dayton, Ohio, September 1996.
• John W. Sheppard and Jonas Åstrand , “Modeling Diagnostic Constraints with AI-ESTATE,” IEEE AUTOTESTCON ‘95 Conference Record, Atlanta, Georgia, August 1995, winner of Best Student Paper award.
• John W. Sheppard and William R. Simpson, “A View of the ABBET™ Upper Layers,” IEEE AUTOTESTCON ‘95 Conference Record, Atlanta, Georgia, August 1995.
• William R. Simpson and John W. Sheppard, “Dependency Modeling Pitfalls,” IEEE AUTOTESTCON 94 Conference Record, Anaheim, CA, September 1994.
• John W. Sheppard and William R. Simpson, “Multiple Failure Diagnosis,” IEEE AUTOTESTCON 94, Anaheim, CA, September 1994, winner of Best Paper award.
• John W. Sheppard, “Standardizing Diagnostic Models for System Test and Diagnosis,” IEEE AUTOTESTCON 94 Conference Record, Anaheim, CA, September 1994.
• William R. Simpson and John W. Sheppard, “A Data Fusion Approach to Integrated Diagnostics,” Proceedings of the Test Facility Working Group Conference, Las Vegas, Nevada, June 1993.
• Jean-Luc Larraga, William R. Simpson, and John W. Sheppard, “Intelligent Automatic Test Equipment for the Improvement of Avionics Maintenance,” Proceedings of ToolDiag 93, Toulouse, France, 1993.
• William R. Simpson and John W. Sheppard, “The Multicriterion Nature of Diagnosis,” IEEE AUTOTESTCON 93, San Antonio, TX, September 1993, co-authored with William R. Simpson.
• John W. Sheppard and William R. Simpson, “A Systems Approach to Specifying Built-in Tests,” Proceedings of the Test Facility Working Group Conference, Las Vegas, Nevada, June 1993.
• William R. Simpson and John W. Sheppard, “Analysis of False Alarms During System Design,” Proceedings of the 1992 National Aerospace Electronics Conference, Dayton, Ohio, May 1992.
• John W. Sheppard, and William R. Simpson, “Automated Production of Information Models for Use in Model-Based Diagnosis,” Proceedings of the 1992 National Aerospace Electronics Conference, Dayton, Ohio, May 1992, co-authored with William R. Simpson.
• Larry V. Kirkland, John W. Sheppard, and William R. Simpson, “Evaluating AI-ESTATE Standards Compliance Using a Functional Intelligence Ratio,” IEEE AUTOTESTCON 92 Conference Record, Dayton, Ohio, September 1992, winner of Walter E. Peterson Award for Best New Technology Paper.
• John W. Sheppard, “Explanation Based Learning With Diagnostic Models,” IEEE AUTOTESTCON 92 Conference Record, Dayton, Ohio, September 1992.
• John W. Sheppard and William R. Simpson, “Fault Diagnosis Under Temporal Constraints,” IEEE AUTOTESTCON 92 Conference Record, Dayton, Ohio, September 1992.
• Russell Crowe, William R. Simpson, and John W. Sheppard, “A Hierarchical Modeling Approach to System-Level Testability and Diagnosis,” Proceedings of the ASNE Product Engineering Symposium, Louisville, Kentucky, September 1992.
• Leonard Haynes, Sharon Goodall, Floyd Phillips, William R. Simpson, and John W. Sheppard, “Test Strategy Component of an Open Architecture for Electronics Design and Support Tools,” IEEE AUTOTESTCON 92 Conference Record, Dayton, Ohio, September 1992.
• William R. Simpson and John W. Sheppard, “A Data Fusion Approach to Integrated Diagnostics,” Proceedings of the Symposium on Artificial Intelligence for Military Logistics, Williamsburg, Virginia, March 1991.
• William R. Simpson and John W. Sheppard, “Developing Intelligent Automatic Test Equipment,” Proceedings of the 1991 National Aerospace and Electronics Conference, Dayton, Ohio, May 1991.
• John W. Sheppard and William R. Simpson, “A Neural Network for Evaluating Diagnostic Evidence,” Proceedings of the 1991 National Aerospace and Electronics Conference, Dayton, Ohio, May 1991.
• William R. Simpson and John W. Sheppard, “Partitioning Large Diagnostic Problems,” IEEE AUTOTESTCON `91 Conference Record, Anaheim, California, September 1991.
• Arnold G. Blair, John W. Sheppard, and William R. Simpson, “Reducing Logistics Costs Through Improved Field Maintenance,” Society of Logistics Engineers, Proceedings of the 26th Annual International Logistics Symposium, Dallas, Texas, August 1991.
• John W. Sheppard and William R. Simpson, “Uncertainty Calculations in Model-Based Reasoning,” IEEE AUTOTESTCON `91 Conference Record, Anaheim, California, September 1991.
• William R. Simpson and John W. Sheppard, “The Application of Evidential Reasoning in a Portable Maintenance Aid,” AUTOTESTCON '90 Conference Record, San Antonio, Texas, September 1990.
• Eugene A. Esker, William R. Simpson, and John W. Sheppard, “An Embedded Maintenance Subsystem,” IEEE AUTOTESTCON '90 Conference Record, San Antonio, Texas, September 1990.
• John W. Sheppard and William R. Simpson, “Experiences with a Model-Based Approach to the Fault Detection and Isolation of Complex Systems,” Symposium on Artificial Intelligence Applications for Military Logistics, March 1990.
• William R. Simpson and John W. Sheppard, “Performing Effective Fault Isolation in Integrated Diagnostics: A Hierarchical Approach to System-Level Diagnostics,” Proceedings of the 9th Digital Avionics Systems Conference, Virginia Beach, VA, October 1990.
• John W. Sheppard and William R. Simpson, “Incorporating Model-Based Reasoning in Interactive Maintenance Aids,” Proceedings of the 1990 National Aerospace and Electronics Conference, Dayton, Ohio, May 1990.
• John W. Sheppard and William R. Simpson, “Integrated Diagnosis -- A Hierarchical Approach,” IEEE AUTOTESTCON '90 Conference Record, San Antonio, Texas, September 1990.
• William R. Simpson, John W. Sheppard, and C. Richard Unkle, “POINTER - An Intelligent Maintenance Assistant,” IEEE AUTOTESTCON '89 Conference Record, Philadelphia, Pennsylvania, September 1989