1. Public Trust in Health Information: Foundational Principles for Dependable Systems Dixie B. Baker, Ph.D. Vice President for Technology CTO, Enterprise and Infrastructure Solutions Group Presented by Kathleen A. McCormick, Ph.D. Senior Scientist/Vice President SAIC, Health Solutions

2. 2 Realization of the Vision Brings Risk IT Dependency and Value eHealth – Realization of NHIN Time RISK Stage 3: The Digital Doctor Patient ownership of record Integrated EMR available anywhere, exchangable across caregivers, minable for syndromic surveillance Integrated, individualized decision support Data exchanged over shared, public networks (Internet) Stage 2: The Bewildered Doctor “System of systems” through the miracle of integration engines Electronic clinical data Electronic administrative transactions with trading partners General-use decision-making tools (e.g., drug-drug interactions) Stage 1: The Family Doctor Minimal use of IT in clinical care “Departmental” systems Private networks Decision making as an “art”

3. 3 Confronting Risk – Assuring Public Trust System reliability Service availability Information confidentiality Data integrity Software safety As provider organizations increase their dependence on information technology in the delivery of clinical care, DEPENDABILITY becomes essential for business success, quality care, and patient safety!

4. 4 From:Baker, D. Dependable Systems for Quality Care. in Saba, VK and McCormick, KA. Essentials of Nursing Informatics, 4th Edition, New York:McGraw-Hill Book Co., in press 2005 5 Guidelines for Dependability 1.Architect for dependability.  Architect enterprise systems from the bottom up so that no critical component is dependent upon a component less trustworthy than itself.  Minimize complexity – the simplest design and integration strategy will be the most understandable, maintainable, and recoverable.  Avoid/eliminate single-point failures – distributed architectures can tolerate failure more easily than large, centralized systems.  Incorporate redundancy & fail-over for critical components.  Implement security in depth to protect sensitive information from unauthorized disclosure, critical data from corruption and destruction, and essential services from interruption.

5. 5 Dependability Requires Architectural Assurance Confidence that enterprise systems will: Deliver services as described in functional specification; Deliver services as described in functional specification; Not exhibit behaviors that are unexpected, malicious, or harmful; and Not exhibit behaviors that are unexpected, malicious, or harmful; and Be available when they are needed. Be available when they are needed.

6. 6 Dependable Architectures Recognize Dependencies Safety FUNCTIONAL CAPABILITIES Security FUNCTIONAL CAPABILITIES

7. 7 5 Guidelines for Dependability 2.Expect failures.  Implement application-transparent features to detect faults, failover to redundant components, and recover from infrastructure failures.  Implement application-specific features to handle exceptions in software execution.  Implement features to detect, recover from, and survive malicious attacks while preserving system stability and security.  Design and build safety-critical systems to fail in a safe state. 3.Expect success.  Plan for scalability.  Plan for integration with other systems.  Model use-case scenarios and associated data flows, system loading, and network impact.

8. 8 5 Guidelines for Dependability 4.Hire meticulous managers (with just a touch of paranoia) to manage your systems and networks.  Use middleware to manage workload.  Use out-of-band tools to monitor and manage system and network performance.  Develop and execute plans and procedures for managing emergencies and recovering from disasters. 5.Don’t be adventurous.  Use proven methods, tools, technologies, and products that have been in production, under conditions and at a scale similar to yours.  Don’t be the first (or second) to adopt a new technology.

9. 9 Contact Information

10. 10 Local Health Solutions Kathleen A. McCormick, Ph.D. Senior Scientist/Vice President SAIC Health Solutions Falls Church, VA and Rockville, MD 703 575-7209 Kathleen.a.mccormick@saic.com